File: CHANGELOG.rst

package info (click to toggle)
python-marshmallow 3.10.0-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 1,076 kB
  • sloc: python: 10,539; makefile: 14
file content (2004 lines) | stat: -rw-r--r-- 74,447 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
Changelog
---------

3.10.0 (2020-12-19)
*******************

Deprecations:

- Passing field metadata via keyword arguments is deprecated and will be
  removed in marshmallow 4 (:issue:`1350`). Use the explicit `metadata=...`
  argument instead. Thanks :user:`sirosen`.

3.9.1 (2020-11-07)
******************

Bug fixes:

- Cast to mapping type in ``Mapping.serialize`` and ``Mapping.deserialize``
  (:pr:`1685`).
- Fix bug letting ``Dict`` pass invalid dict on deserialization when no key or
  value ``Field`` is specified (:pr:`1685`).

3.9.0 (2020-10-31)
******************

Features:

- Add ``format`` argument to ``fields.Time`` and ``timeformat`` *class Meta* option (:issue:`686`).
  Thanks :user:`BennyAlex` for the suggestion and thanks :user:`infinityxxx` for the PR.

Other changes:

- Remove usage of implicit ``typing.Optional`` (:issue:`1663`).
  Thanks :user:`nadega` for the PR.

3.8.0 (2020-09-16)
******************

Features:

- Add ``fields.IP``, ``fields.IPv4`` and ``fields.IPv6`` (:pr:`1485`). Thanks
  :user:`mgetka` for the PR.

Bug fixes:

- Fix typing in ``AwareDateTime`` (:pr:`1658`). Thanks :user:`adithyabsk` for
  reporting.

3.7.1 (2020-07-20)
******************

Bug fixes:

- ``fields.Boolean`` correctly serializes non-hashable types (:pr:`1633`).
  Thanks :user:`jun0jang` for the PR.

3.7.0 (2020-07-08)
******************

Deprecations:

- `marshmallow.pprint` is deprecated and will be removed in marshmallow 4 (:issue:`1588`).

Support:

- Document ``default_error_messages`` on field classes (:pr:`1619`). Thanks :user:`weeix`.

Bug fixes:

- Fix passing ``only`` and ``exclude`` to ``Nested`` with an ordered ``Schema`` (:pr:`1627`).
  Thanks :user:`juannorris` for the PR.

3.6.1 (2020-06-02)
******************

No code changes--only docs and contributor-facing updates in this release.

Support:

- Documentation: improve custom fields example (:issue:`1538`).
  Thanks :user:`pablospizzamiglio` for reporting the problem with the
  old example and thanks :user:`Resinderate` for the PR.
- Documentation: Split up API reference into multiple pages and
  add summary tables (:pr:`1587`). Thanks :user:`EpicWink` for the PR.

3.6.0 (2020-05-08)
******************

Features:

- Add ``validate.ContainsNoneOf`` (:issue:`1528`).
  Thanks :user:`Resinderate` for the suggestion and the PR.


3.5.2 (2020-04-30)
******************

Bug fixes:

- Fix typing in ``class_registry`` (:pr:`1574`). Thanks :user:`mahenzon`.

3.5.1 (2020-03-05)
******************

Bug fixes:

- Includes bug fix from 2.21.0.

3.5.0 (2020-02-19)
******************

Bug fixes:

- Fix list of nullable nested fields ``List(Nested(Field, allow_none=True)``
  (:issue:`1497`). Because this fix reverts an optimization introduced to
  speed-up serialization and deserialization of lists of nested fields, a
  negative impact on performance in this specific case is expected.

3.4.0 (2020-02-02)
******************

Features:

- Improve type coverage (:issue:`1479`). Thanks :user:`Reskov`.

Bug fixes:

- Fix typing for ``data`` param of ``Schema.load`` and ``ValidationError`` (:issue:`1492`).
  Thanks :user:`mehdigmira` for reporting and thanks :user:`dfirst` for the PR.

Other changes:

- Remove unnecessary typecasts (:pr:`1500`). Thanks :user:`hukkinj1`.
- Remove useless ``_serialize`` override in ``UUID`` field (:pr:`1489`).

3.3.0 (2019-12-05)
******************

Features:

- ``fields.Nested`` may take a callable that returns a schema instance.
  Use this to resolve order-of-declaration issues when schemas nest each other (:issue:`1146`).

.. code-block:: python

    # <3.3
    class AlbumSchema(Schema):
        title = fields.Str()
        artist = fields.Nested("ArtistSchema", only=("name",))


    class ArtistSchema(Schema):
        name = fields.Str()
        albums = fields.List(fields.Nested(AlbumSchema))


    # >=3.3
    class AlbumSchema(Schema):
        title = fields.Str()
        artist = fields.Nested(lambda: ArtistSchema(only=("name",)))


    class ArtistSchema(Schema):
        name = fields.Str()
        albums = fields.List(fields.Nested(AlbumSchema))

Deprecations:

- Passing the string ``"self"`` to ``fields.Nested`` is deprecated.
  Use a callable instead.

.. code-block:: python

    from marshmallow import Schema, fields

    # <3.3
    class PersonSchema(Schema):
        partner = fields.Nested("self", exclude=("partner",))
        friends = fields.List(fields.Nested("self"))


    # >=3.3
    class PersonSchema(Schema):
        partner = fields.Nested(lambda: PersonSchema(exclude=("partner")))
        friends = fields.List(fields.Nested(lambda: PersonSchema()))

Other changes:

- Fix typing for ``Number._format_num`` (:pr:`1466`). Thanks :user:`hukkinj1`.
- Make mypy stricter and remove dead code (:pr:`1467`). Thanks again, :user:`hukkinj1`.

3.2.2 (2019-11-04)
******************

Bug fixes:

- Don't load fields for which ``load_only`` and ``dump_only`` are both ``True`` (:pr:`1448`).
- Fix types in ``marshmallow.validate`` (:pr:`1446`).

Support:

- Test against Python 3.8 (:pr:`1431`).

3.2.1 (2019-09-30)
++++++++++++++++++

Bug fixes:

- Fix typing for ``Schema.dump[s]`` (:pr:`1416`).

3.2.0 (2019-09-17)
++++++++++++++++++

Features:

- Add type annotations to ``marshmallow.schema`` and ``marshmallow.validate`` (:pr:`1407`, :issue:`663`).

Bug fixes:

- Fix compatibility with Python < 3.5.3 (:issue:`1409`). Thanks :user:`lukaszdudek-silvair` for reporting.

Refactoring:

- Remove unnecessary ``BaseSchema`` superclass (:pr:`1406`).

3.1.1 (2019-09-16)
++++++++++++++++++

Bug fixes:

- Restore inheritance hierarchy of ``Number`` fields (:pr:`1403`).
  ``fields.Integer`` and ``fields.Decimal`` inherit from ``fields.Number``.
- Fix bug that raised an uncaught error when a nested schema instance had an unpickleable object in its context (:issue:`1404`).
  Thanks :user:`metheoryt` for reporting.

3.1.0 (2019-09-15)
++++++++++++++++++

Features:

- Add more type annotations (:issue:`663`).
  Type information is distributed per `PEP 561 <https://www.python.org/dev/peps/pep-0561/>`_ .
  Thanks :user:`fuhrysteve` for helping with this.

Bug fixes:

- Includes bug fix from 2.20.5.

3.0.5 (2019-09-12)
++++++++++++++++++

Bug fixes:

- Fix bug that raised an uncaught error when passing both a schema instance and ``only`` to ``Nested`` (:pr:`1395`).
  This bug also affected passing a schema instance to ``fields.Pluck``.


3.0.4 (2019-09-11)
++++++++++++++++++

Bug fixes:

- Fix propagating dot-delimited `only` and `exclude` parameters to nested schema instances (:issue:`1384`).
- Includes bug fix from 2.20.4 (:issue:`1160`).

3.0.3 (2019-09-04)
++++++++++++++++++

Bug fixes:

- Handle when ``data_key`` is an empty string (:issue:`1378`).
  Thanks :user:`jtrakk` for reporting.

3.0.2 (2019-09-04)
++++++++++++++++++

Bug fixes:

- Includes bug fix from 2.20.3 (:pr:`1376`).
- Fix incorrect ``super()`` call in ``SchemaMeta.__init__`` (:pr:`1362`).

3.0.1 (2019-08-21)
++++++++++++++++++

Bug fixes:

- Fix bug when nesting ``fields.DateTime`` within ``fields.List`` or ``fields.Tuple`` (:issue:`1357`).
  This bug was introduced in 3.0.0rc9. Thanks :user:`zblz` for reporting.

3.0.0 (2019-08-18)
++++++++++++++++++

Features:

- Optimize ``List(Nested(...))`` (:issue:`779`).
- Minor performance improvements and cleanup (:pr:`1328`).
- Add ``Schema.from_dict`` (:issue:`1312`).

Deprecations/Removals:

- ``Field.fail`` is deprecated. Use ``Field.make_error`` instead.
- Remove UUID validation from ``fields.UUID``, for consistency with other fields (:issue:`1132`).

Support:

- Various docs improvements (:pr:`1329`).

3.0.0rc9 (2019-07-31)
+++++++++++++++++++++

Features:

- *Backwards-incompatible*: Validation does not occur on serialization (:issue:`1132`).
  This significantly improves serialization performance.
- *Backwards-incompatible*: ``DateTime`` does not affect timezone information
  on serialization and deserialization (:issue:`1234`, :pr:`1278`).
- Add ``NaiveDateTime`` and ``AwareDateTime`` to enforce timezone awareness
  (:issue:`1234`, :pr:`1287`).
- *Backwards-incompatible*: ``List`` does not wrap single values in a list on
  serialization (:pr:`1307`).
- *Backwards-incompatible*: ``Schema.handle_error`` receives ``many`` and ``partial`` as keyword arguments (:pr:`1321`).
- Use `raise from` more uniformly to improve stack traces (:pr:`1313`).
- Rename ``Nested.__schema`` to ``Nested._schema`` to prevent name mangling (:issue:`1289`).
- Performance improvements (:pr:`1309`).

Deprecations/Removals:

- ``LocalDateTime`` is removed (:issue:`1234`).
- ``marshmallow.utils.utc`` is removed. Use ``datetime.timezone.utc`` instead.

Bug fixes:

- Fix behavior of `List(Nested("self"))` (`#779 (comment) <https://github.com/marshmallow-code/marshmallow/issues/779#issuecomment-396354987>`_).

Support:

- Document usage of  `validate.Regexp`'s usage `re.search` (:issue:`1285`). Thanks :user:`macdonaldezra`.

3.0.0rc8 (2019-07-04)
+++++++++++++++++++++

Features:

- Propagate ``only`` and ``exclude`` parameters to ``Nested`` fields
  within ``List`` and ``Dict`` (:issue:`779`, :issue:`946`).
- Use ``email.utils.parsedate_to_datetime`` instead of conditionally
  using dateutil for parsing RFC dates (:pr:`1246`).
- Use internal util functions instead of conditionally using dateutil
  for parsing  ISO 8601 datetimes, dates and times. Timezone info is now
  correctly deserialized whether or not dateutil is installed. (:pr:`1265`)
- Improve error messages for ``validate.Range``.
- Use ``raise from error`` for better stack traces (:pr:`1254`). Thanks
  :user:`fuhrysteve`.
- python-dateutil is no longer used. This resolves the inconsistent behavior
  based on the presence of python-dateutil (:issue:`497`, :issue:`1234`).

Bug fixes:

- Fix method resolution for ``__init__`` method of ``fields.Email`` and
  ``fields.URL`` (:issue:`1268`). Thanks :user:`dursk` for the catch and patch.
- Includes bug fixes from 2.19.4 and 2.19.5.

Other changes:

- *Backwards-incompatible*: Rename ``fields.List.container`` to ``fields.List.inner``,
  ``fields.Dict.key_container`` to ``fields.Dict.key_field``, and
  ``fields.Dict.value_container`` to ``fields.Dict.value_field``.
- Switch to Azure Pipelines for CI (:issue:`1261`).

3.0.0rc7 (2019-06-15)
+++++++++++++++++++++

Features:

- *Backwards-incompatible*: ``many`` is passed as a keyword argument to methods decorated with
  ``pre_load``, ``post_load``, ``pre_dump``, ``post_dump``,
  and ``validates_schema``. ``partial`` is passed as a keyword argument to
  methods decorated with ``pre_load``, ``post_load`` and ``validates_schema``.
  ``**kwargs`` should be added to all decorated methods.
- Add ``min_inclusive`` and ``max_exclusive`` parameters to
  ``validate.Range`` (:issue:`1221`). Thanks :user:`kdop` for the PR.

Bug fixes:

- Fix propagation of "partial" to Nested containers (part of :issue:`779`).
- Includes bug fix from 2.19.3.

Other changes:

- *Backwards-incompatible*: Use keyword-only arguments (:issue:`1216`).

3.0.0rc6 (2019-05-05)
+++++++++++++++++++++

Support:

- *Backwards-incompatible*: Remove support for Python 2 (:issue:`1120`).
  Only Python>=3.5 is supported.
  Thank you :user:`rooterkyberian` for the suggestion and the PR.
- *Backwards-incompatible*: Remove special-casing in ``fields.List`` and
  ``fields.Tuple`` for accessing nested attributes (:pr:`1188`).
  Use ``fields.List(fields.Pluck(...))`` instead.
- Add ``python_requires`` to ``setup.py`` (:pr:`1194`).
  Thanks :user:`hugovk`.
- Upgrade syntax with ``pyupgrade`` in pre-commit (:pr:`1195`). Thanks
  again :user:`hugovk`.

3.0.0rc5 (2019-03-30)
+++++++++++++++++++++

Features:

- Allow input value to be included in error messages
  for a number of fields (:pr:`1129`). Thanks :user:`hdoupe` for the PR.
- Improve default error messages for ``OneOf`` and ``ContainsOnly``
  (:issue:`885`). Thanks :user:`mcgfeller` for the suggestion
  and :user:`maxalbert` for the PR.

Deprecations/Removals:

- Remove ``fields.FormattedString`` (:issue:`1141`). Use
  ``fields.Function`` or ``fields.Method`` instead.

Bug fixes:

- Includes bug fix from 2.19.2.

3.0.0rc4 (2019-02-08)
+++++++++++++++++++++

Features:

- Add ``fields.Tuple`` (:issue:`1103`) Thanks :user:`zblz` for the PR.
- Add ``fields.Mapping``, which makes it easier to support other
  mapping types (e.g. ``OrderedDict``)  (:issue:`1092`).
  Thank :user:`sayanarijit` for the suggestion and the PR.

3.0.0rc3 (2019-01-13)
+++++++++++++++++++++

Features:

- Make the error messages for "unknown fields" and "invalid data type"
  configurable (:issue:`852`). Thanks :user:`Dunstrom` for the PR.
- ``fields.Boolean`` parses ``"yes"``/``"no"`` values (:pr:`1081`).
  Thanks :user:`r1b`.

Other changes:

- *Backwards-incompatible with previous 3.x versions*: Change ordering
  of ``keys`` and ``values`` arguments to ``fields.Dict``.
- Remove unused code in `marshmallow.utils`: ``is_indexable_but_not_string``,
  ``float_to_decimal``, ``decimal_to_fixed``, ``from_iso`` (:pr:`1088`).
- Remove unused ``marshmallow.compat.string_types``.

Bug fixes:

- Includes bug fix from 2.18.0.

3.0.0rc2 (2019-01-03)
+++++++++++++++++++++

Features:

- Add ``register`` *class Meta* option to allow bypassing marshmallow's
  internal class registry when memory usage is critical (:issue:`660`).

Bug fixes:

- Fix serializing dict-like objects with properties (:issue:`1060`).
  Thanks :user:`taion` for the fix.
- Fix populating ``ValidationError.valid_data`` for ``List`` and
  ``Dict`` fields (:issue:`766`).

Other changes:

- Add ``marshmallow.__version_info__`` (:pr:`1074`).
- Remove the ``marshmallow.marshalling`` internal module (:pr:`1070`).
- A ``ValueError`` is raised when the ``missing`` parameter is passed
  for required fields (:issue:`1040`).
- Extra keyword arguments passed to ``ValidationError`` in validators
  are no longer passed to the final ``ValidationError`` raised upon
  validation completion (:issue:`996`).

3.0.0rc1 (2018-11-29)
+++++++++++++++++++++

Features:

- *Backwards-incompatible*: Rework ``ValidationError`` API.
  It now expects a single field name, and error structures are merged
  in the final ``ValidationError`` raised when validation completes.
  This allows schema-level validators to raise errors for individual
  fields (:issue:`441`). Thanks :user:`maximkulkin` for
  writing the original ``merge_errors`` implementation in :pr:`442` and thanks
  :user:`lafrech` for completing the implementation in :pr:`1026`.

Bug fixes:

- Fix ``TypeError`` when serializing ``None`` with ``Pluck`` (:pr:`1049`).
  Thanks :user:`toffan` for the catch and patch.

3.0.0b20 (2018-11-01)
+++++++++++++++++++++

Bug fixes:

- Includes bug fixes from 2.16.2 and 2.16.3.

3.0.0b19 (2018-10-24)
+++++++++++++++++++++

Features:

- Support partial loading of nested fields (:pr:`438`). Thanks
  :user:`arbor-dwatson` for the PR. *Note*: Subclasses of ``fields.Nested``
  now take an additional ``partial`` parameter in the ``_deserialize``
  method.

Bug fixes:

- Restore ``Schema.TYPE_MAPPING``, which was removed in 3.0.0b17 (:issue:`1012`).

Other changes:

- *Backwards-incompatible*: ``_serialize`` and ``_deserialize`` methods of
all ``fields.Field`` subclasses must accept ``**kwargs`` (:pr:`1007`).


3.0.0b18 (2018-10-15)
+++++++++++++++++++++

Bug fixes:

- Fix ``Date`` deserialization when using custom format (:issue:`1001`). Thanks
  :user:`Ondkloss` for reporting.

Deprecations/Removals:

- ``prefix`` parameter or ``Schema`` class is removed (:issue:`991`). The same
  can be achieved using a ``@post_dump`` method.


3.0.0b17 (2018-10-13)
+++++++++++++++++++++

Features:

- Add ``format`` option to ``Date`` field (:pr:`869`).
- *Backwards-incompatible*: Rename ``DateTime``'s ``dateformat`` Meta option
  to ``datetimeformat``. ``dateformat`` now applies to ``Date`` (:pr:`869`).
  Thanks :user:`knagra` for implementing these changes.
- Enforce ISO 8601 when deserializing date and time (:issue:`899`).
  Thanks :user:`dushr` for the report and the work on the PR.
- *Backwards-incompatible*: Raise ``ValueError`` on ``Schema`` instantiation in
  case of ``attribute`` or ``data_key`` collision (:pr:`992`).

Bug fixes:

- Fix inconsistencies in field inference by refactoring the inference feature
  into a dedicated field (:issue:`809`). Thanks :user:`taion` for the PR.
- When ``unknown`` is not passed to ``Nested``, default to nested ``Schema``
  ``unknown`` meta option rather than ``RAISE`` (:pr:`963`).
  Thanks :user:`vgavro` for the PR.
- Fix loading behavior of ``fields.Pluck`` (:pr:`990`).
- Includes bug fix from 2.16.0.

3.0.0b16 (2018-09-20)
+++++++++++++++++++++

Bug fixes:

- Fix ``root`` attribute for nested container fields
  on inheriting schemas (:issue:`956`). Thanks :user:`bmcbu`
  for reporting.

3.0.0b15 (2018-09-18)
+++++++++++++++++++++

Bug fixes:

- Raise ``ValidationError`` instead of ``TypeError`` when non-iterable types are
  validated with ``many=True`` (:issue:`851`).
- ``many=True`` no longer iterates over ``str`` and ``collections.abc.Mapping`` objects and instead
  raises a ``ValidationError`` with ``{'_schema': ['Invalid input type.']}`` (:issue:`930`).
- Return ``[]`` as ``ValidationError.valid_data`` instead of ``{}`` when
  ``many=True`` (:issue:`907`).

Thanks :user:`tuukkamustonen` for implementing these changes.

3.0.0b14 (2018-09-15)
+++++++++++++++++++++

Features:

- Add ``fields.Pluck`` for serializing a single field from a nested object
  (:issue:`800`). Thanks :user:`timc13` for the feedback and :user:`deckar01`
  for the implementation.
- *Backwards-incompatible*: Passing a string argument as ``only`` to
  ``fields.Nested`` is no longer supported. Use ``fields.Pluck`` instead
  (:issue:`800`).
- Raise a `StringNotCollectionError` if ``only`` or ``exclude`` is
  passed as a string to ``fields.Nested`` (:pr:`931`).
- *Backwards-incompatible*: ``Float`` takes an ``allow_nan`` parameter to
  explicitly allow serializing and deserializing special values (``nan``,
  ``inf`` and ``-inf``). ``allow_nan`` defaults to ``False``.

Other changes:

- *Backwards-incompatible*: ``Nested`` field now defaults to ``unknown=RAISE``
  instead of ``EXCLUDE``. This harmonizes behavior with ``Schema`` that
  already defaults to ``RAISE`` (:issue:`908`). Thanks :user:`tuukkamustonen`.
- Tested against Python 3.7.

3.0.0b13 (2018-08-04)
+++++++++++++++++++++

Bug fixes:

- Errors reported by a schema-level validator for a field in a ``Nested`` field
  are stored under corresponding field name, not ``_schema`` key (:pr:`862`).
- Includes bug fix from 2.15.4.

Other changes:

- *Backwards-incompatible*: The ``unknown`` option now defaults to ``RAISE``
  (`#524 (comment) <https://github.com/marshmallow-code/marshmallow/issues/524#issuecomment-397165731>`_,
  :issue:`851`).
- *Backwards-incompatible*: When a schema error is raised with a ``dict`` as
  payload, the ``dict`` overwrites any existing error list. Before this change,
  it would be appended to the list.
- Raise a `StringNotCollectionError` if ``only`` or ``exclude`` is
  passed as a string (:issue:`316`). Thanks :user:`paulocheque` for
  reporting.

3.0.0b12 (2018-07-04)
+++++++++++++++++++++

Features:

- The behavior to apply when encountering unknown fields while deserializing
  can be controlled with the ``unknown`` option (:issue:`524`,
  :issue:`747`, :issue:`127`).
  It makes it possible to either "include", "exclude", or "raise".
  Thanks :user:`tuukkamustonen` for the suggestion and thanks
  :user:`ramnes` for the PR.

.. warning::

  The default for ``unknown`` will be changed to ``RAISE`` in the
  next release.

Other changes:

- *Backwards-incompatible*: Pre/Post-processors MUST return modified data.
  Returning ``None`` does not imply data were mutated (:issue:`347`). Thanks
  :user:`tdevelioglu` for reporting.
- *Backwards-incompatible*: ``only`` and ``exclude`` are bound by
  declared and additional fields. A ``ValueError`` is raised if invalid
  fields are passed (:issue:`636`). Thanks :user:`jan-23` for reporting.
  Thanks :user:`ikilledthecat` and :user:`deckar01` for the PRs.
- Format code using pre-commit (:pr:`855`).

Deprecations/Removals:

- ``ValidationError.fields`` is removed (:issue:`840`). Access field
  instances from ``Schema.fields``.

3.0.0b11 (2018-05-20)
+++++++++++++++++++++

Features:

- Clean up code for schema hooks (:pr:`814`). Thanks :user:`taion`.
- Minor performance improvement from simplifying ``utils.get_value`` (:pr:`811`). Thanks again :user:`taion`.
- Add ``require_tld`` argument to ``fields.URL`` (:issue:`749`). Thanks
  :user:`DenerKup` for reporting and thanks :user:`surik00` for the PR.
- ``fields.UUID`` deserializes ``bytes`` strings using ``UUID(bytes=b'...')`` (:pr:`625`).
  Thanks :user:`JeffBerger` for the suggestion and the PR.

Bug fixes:

- Fields nested within ``Dict`` correctly inherit context from their
  parent schema (:issue:`820`). Thanks :user:`RosanneZe` for reporting
  and :user:`deckar01` for the PR.
- Includes bug fix from 2.15.3.


3.0.0b10 (2018-05-10)
+++++++++++++++++++++

Bug fixes:

- Includes bugfixes from 2.15.2.

3.0.0b9 (2018-04-25)
++++++++++++++++++++

Features:

- *Backwards-incompatible*: ``missing`` and ``default`` values are
  passed in deserialized form (:issue:`378`). Thanks :user:`chadrik` for
  the suggestion and thanks :user:`lafrech` for the PR.

Bug fixes:

- Includes the bugfix from 2.15.1.

3.0.0b8 (2018-03-24)
++++++++++++++++++++

Features:

- *Backwards-incompatible*: Add ``data_key`` parameter to fields for
  specifying the key in the input and output data dict. This
  parameter replaces both ``load_from`` and ``dump_to`` (:issue:`717`).
  Thanks :user:`lafrech`.
- *Backwards-incompatible*: When `pass_original=True` is passed to one
  of the decorators and a collection is being (de)serialized, the
  `original_data` argument will be a single object unless
  `pass_many=True` is also passed to the decorator (:issue:`315`,
  :issue:`743`). Thanks :user:`stj` for the PR.
- *Backwards-incompatible*: Don't recursively check nested required
  fields when the Nested field's key is missing (:issue:`319`). This
  reverts :pr:`235`. Thanks :user:`chekunkov` reporting and thanks
  :user:`lafrech` for the PR.
- *Backwards-incompatible*: Change error message collection for `Dict` field (:issue:`730`). Note:
  this is backwards-incompatible with previous 3.0.0bX versions.
  Thanks :user:`shabble` for the report and thanks :user:`lafrech` for the PR.

3.0.0b7 (2018-02-03)
++++++++++++++++++++

Features:

- *Backwards-incompatible*: Schemas are always strict (:issue:`377`).
  The ``strict`` parameter is removed.
- *Backwards-incompatible*: `Schema().load` and `Schema().dump` return ``data`` instead of a
  ``(data, errors)`` tuple (:issue:`598`).
- *Backwards-incomaptible*: `Schema().load(None)` raises a
  `ValidationError` (:issue:`511`).

See :ref:`upgrading_3_0` for a guide on updating your code.

Thanks :user:`lafrech` for implementing these changes.
Special thanks to :user:`MichalKononenko`, :user:`douglas-treadwell`, and
:user:`maximkulkin` for the discussions on these changes.


Other changes:

- *Backwards-incompatible*: Field name is not checked when ``load_from``
  is specified (:pr:`714`). Thanks :user:`lafrech`.

Support:

- Add `Code of Conduct <https://marshmallow.readthedocs.io/en/dev/code_of_conduct.html>`_.


3.0.0b6 (2018-01-02)
++++++++++++++++++++

Bug fixes:

- Fixes `ValidationError.valid_data` when a nested field contains errors
  (:issue:`710`). This bug was introduced in 3.0.0b3. Thanks
  :user:`lafrech`.

Other changes:

- *Backwards-incompatible*: ``Email`` and ``URL`` fields don't validate
  on serialization (:issue:`608`). This makes them more consistent with the other
  fields and improves serialization performance. Thanks again :user:`lafrech`.
- ``validate.URL`` requires square brackets around IPv6 URLs (:issue:`707`). Thanks :user:`harlov`.

3.0.0b5 (2017-12-30)
++++++++++++++++++++

Features:

- Add support for structured dictionaries by providing values and keys arguments to the
  ``Dict`` field's constructor. This mirrors the ``List``
  field's ability to validate its items (:issue:`483`). Thanks :user:`deckar01`.

Other changes:

- *Backwards-incompatible*: ``utils.from_iso`` is deprecated in favor of
  ``utils.from_iso_datetime`` (:issue:`694`). Thanks :user:`sklarsa`.

3.0.0b4 (2017-10-23)
++++++++++++++++++++

Features:

- Add support for millisecond, minute, hour, and week precisions to
  ``fields.TimeDelta`` (:issue:`537`). Thanks :user:`Fedalto` for the
  suggestion and the PR.
- Includes features from release 2.14.0.


Support:

- Copyright year in docs uses CHANGELOG.rst's modified date for
  reproducible builds (:issue:`679`). Thanks :user:`bmwiedemann`.
- Test against Python 3.6 in tox. Thanks :user:`Fedalto`.
- Fix typo in exception message (:issue:`659`). Thanks :user:`wonderbeyond`
  for reporting and thanks :user:`yoichi` for the PR.

3.0.0b3 (2017-08-20)
++++++++++++++++++++

Features:

- Add ``valid_data`` attribute to ``ValidationError``.
- Add ``strict`` parameter to ``Integer`` (:issue:`667`). Thanks
  :user:`yoichi`.

Deprecations/Removals:

- Deprecate ``json_module`` option in favor of ``render_module`` (:issue:`364`, :issue:`130`). Thanks :user:`justanr` for the suggestion.

Bug fixes:

- Includes bug fixes from releases 2.13.5 and 2.13.6.
- *Backwards-incompatible* : ``Number`` fields don't accept booleans as valid input (:issue:`623`). Thanks :user:`tuukkamustonen` for the suggestion and thanks :user:`rowillia` for the PR.

Support:

- Add benchmark script. Thanks :user:`rowillia`.

3.0.0b2 (2017-03-19)
++++++++++++++++++++

Features:

- Add ``truthy`` and ``falsy`` params to ``fields.Boolean`` (:issue:`580`). Thanks :user:`zwack` for the PR. Note: This is potentially a breaking change if your code passes the `default` parameter positionally. Pass `default` as a keyword argument instead, e.g. ``fields.Boolean(default=True)``.

Other changes:

- *Backwards-incompatible*: ``validate.ContainsOnly`` allows empty and duplicate values (:issue:`516`, :issue:`603`). Thanks :user:`maximkulkin` for the suggestion and thanks :user:`lafrech` for the PR.

Bug fixes:

- Includes bug fixes from release 2.13.4.

3.0.0b1 (2017-03-10)
++++++++++++++++++++

Features:

- ``fields.Nested`` respects ``only='field'`` when deserializing (:issue:`307`). Thanks :user:`erlingbo` for the suggestion and the PR.
- ``fields.Boolean`` parses ``"on"``/``"off"`` (:issue:`580`). Thanks :user:`marcellarius` for the suggestion.


Other changes:

- Includes changes from release 2.13.2.
- *Backwards-incompatible*: ``skip_on_field_errors`` defaults to ``True`` for ``validates_schema`` (:issue:`352`).

3.0.0a1 (2017-02-26)
++++++++++++++++++++

Features:

- ``dump_only`` and ``load_only`` for ``Function`` and ``Method`` are set based on ``serialize`` and ``deserialize`` arguments (:issue:`328`).

Other changes:

- *Backwards-incompatible*: ``fields.Method`` and ``fields.Function`` no longer swallow ``AttributeErrors`` (:issue:`395`). Thanks :user:`bereal` for the suggestion.
- *Backwards-incompatible*: ``validators.Length`` is no longer a subclass of ``validators.Range`` (:issue:`458`). Thanks :user:`deckar01` for the catch and patch.
- *Backwards-incompatible*: ``utils.get_func_args`` no longer returns bound arguments. This is consistent with the behavior of ``inspect.signature``. This change prevents a DeprecationWarning on Python 3.5 (:issue:`415`, :issue:`479`). Thanks :user:`deckar01` for the PR.
- *Backwards-incompatible*: Change the signature of ``utils.get_value`` and ``Schema.get_attribute`` for consistency with Python builtins (e.g. ``getattr``) (:issue:`341`). Thanks :user:`stas` for reporting and thanks :user:`deckar01` for the PR.
- *Backwards-incompatible*: Don't unconditionally call callable attributes (:issue:`430`, reverts :issue:`242`). Thanks :user:`mirko` for the suggestion.
- Drop support for Python 2.6 and 3.3.

Deprecation/Removals:

- Remove ``__error_handler__``, ``__accessor__``, ``@Schema.error_handler``, and ``@Schema.accessor``. Override ``Schema.handle_error`` and ``Schema.get_attribute`` instead.
- Remove ``func`` parameter of ``fields.Function``. Remove ``method_name`` parameter of ``fields.Method`` (issue:`325`). Use the ``serialize`` parameter instead.
- Remove ``extra`` parameter from ``Schema``. Use a ``@post_dump`` method to add additional data.

2.21.0 (2020-03-05)
+++++++++++++++++++

Bug fixes:

- Don't match string-ending newlines in ``URL`` and ``Email`` fields
  (:issue:`1522`). Thanks :user:`nbanmp` for the PR.

Other changes:

- Drop support for Python 3.4 (:pr:`1525`).

2.20.5 (2019-09-15)
+++++++++++++++++++

Bug fixes:

- Fix behavior when a non-list collection is passed to the ``validate`` argument of ``fields.Email`` and ``fields.URL`` (:issue:`1400`).

2.20.4 (2019-09-11)
+++++++++++++++++++

Bug fixes:

- Respect the ``many`` value on ``Schema`` instances passed to ``Nested`` (:issue:`1160`).
  Thanks :user:`Kamforka` for reporting.

2.20.3 (2019-09-04)
+++++++++++++++++++

Bug fixes:

- Don't swallow ``TypeError`` exceptions raised by ``Field._bind_to_schema`` or ``Schema.on_bind_field`` (:pr:`1376`).

2.20.2 (2019-08-20)
+++++++++++++++++++

Bug fixes:

- Prevent warning about importing from ``collections`` on Python 3.7
  (:pr:`1354`). Thanks :user:`nicktimko` for the PR.

2.20.1 (2019-08-13)
+++++++++++++++++++

Bug fixes:

- Fix bug that raised ``TypeError`` when invalid data type is
  passed to a nested schema with ``@validates`` (:issue:`1342`).

2.20.0 (2019-08-10)
+++++++++++++++++++

Bug fixes:

- Fix deprecated functions' compatibility with Python 2 (:issue:`1337`).
  Thanks :user:`airstandley` for the catch and patch.
- Fix error message consistency for invalid input types on nested fields (:issue:`1303`).
  This is a backport of the fix in :pr:`857`. Thanks :user:`cristi23` for the
  thorough bug report and the PR.

Deprecation/Removal:

- Python 2.6 is no longer officially supported (:issue:`1274`).

2.19.5 (2019-06-18)
+++++++++++++++++++

Bug fixes:

- Fix deserializing ISO8601-formatted datetimes with less than 6-digit
  miroseconds (:issue:`1251`). Thanks :user:`diego-plan9` for reporting.

2.19.4 (2019-06-16)
+++++++++++++++++++

Bug fixes:

- Microseconds no longer gets lost when deserializing datetimes without dateutil
  installed (:issue:`1147`).

2.19.3 (2019-06-15)
+++++++++++++++++++

Bug fixes:

- Fix bug where nested fields in ``Meta.exclude`` would not work on
  multiple instantiations (:issue:`1212`). Thanks :user:`MHannila` for
  reporting.

2.19.2 (2019-03-30)
+++++++++++++++++++

Bug fixes:

- Handle ``OverflowError`` when (de)serializing large integers with
  ``fields.Float`` (:pr:`1177`). Thanks :user:`brycedrennan` for the PR.

2.19.1 (2019-03-16)
+++++++++++++++++++

Bug fixes:

- Fix bug where ``Nested(many=True)`` would skip first element when
  serializing a generator (:issue:`1163`). Thanks :user:`khvn26` for the
  catch and patch.

2.19.0 (2019-03-07)
+++++++++++++++++++

Deprecation/Removal:

- A `RemovedInMarshmallow3` warning is raised when using
  `fields.FormattedString`. Use `fields.Method` or `fields.Function`
  instead (:issue:`1141`).

2.18.1 (2019-02-15)
+++++++++++++++++++

Bug fixes:

- A ``ChangedInMarshmallow3Warning`` is no longer raised when
  ``strict=False`` (:issue:`1108`). Thanks :user:`Aegdesil` for
  reporting.

2.18.0 (2019-01-13)
+++++++++++++++++++

Features:

- Add warnings for functions in ``marshmallow.utils`` that are removed in
  marshmallow 3.

Bug fixes:

- Copying ``missing`` with ``copy.copy`` or ``copy.deepcopy`` will not
  duplicate it (:pr:`1099`).

2.17.0 (2018-12-26)
+++++++++++++++++++

Features:

- Add ``marshmallow.__version_info__`` (:pr:`1074`).
- Add warnings for API that is deprecated or changed to help users
  prepare for marshmallow 3 (:pr:`1075`).

2.16.3 (2018-11-01)
+++++++++++++++++++

Bug fixes:

- Prevent memory leak when dynamically creating classes with ``type()``
  (:issue:`732`). Thanks :user:`asmodehn` for writing the tests to
  reproduce this issue.

2.16.2 (2018-10-30)
+++++++++++++++++++

Bug fixes:

- Prevent warning about importing from ``collections`` on Python 3.7
  (:issue:`1027`). Thanks :user:`nkonin` for reporting and
  :user:`jmargeta` for the PR.

2.16.1 (2018-10-17)
+++++++++++++++++++

Bug fixes:

- Remove spurious warning about implicit collection handling
  (:issue:`998`). Thanks :user:`lalvarezguillen` for reporting.

2.16.0 (2018-10-10)
+++++++++++++++++++

Bug fixes:

- Allow username without password in basic auth part of the url in
  ``fields.Url`` (:pr:`982`). Thanks user:`alefnula` for the PR.

Other changes:

- Drop support for Python 3.3 (:pr:`987`).

2.15.6 (2018-09-20)
+++++++++++++++++++

Bug fixes:

- Prevent ``TypeError`` when a non-collection is passed to a ``Schema`` with ``many=True``.
  Instead, raise ``ValidationError`` with ``{'_schema': ['Invalid input type.']}`` (:issue:`906`).
- Fix ``root`` attribute for nested container fields on list
  on inheriting schemas (:issue:`956`). Thanks :user:`bmcbu`
  for reporting.

These fixes were backported from 3.0.0b15 and 3.0.0b16.


2.15.5 (2018-09-15)
+++++++++++++++++++

Bug fixes:

- Handle empty SQLAlchemy lazy lists gracefully when dumping (:issue:`948`).
  Thanks :user:`vke-code` for the catch and :user:`YuriHeupa` for the patch.

2.15.4 (2018-08-04)
+++++++++++++++++++

Bug fixes:

- Respect ``load_from`` when reporting errors for ``@validates('field_name')``
  (:issue:`748`). Thanks :user:`m-novikov` for the catch and patch.

2.15.3 (2018-05-20)
+++++++++++++++++++

Bug fixes:

- Fix passing ``only`` as a string to ``nested`` when the passed field
  defines ``dump_to`` (:issue:`800`, :issue:`822`). Thanks
  :user:`deckar01` for the catch and patch.

2.15.2 (2018-05-10)
+++++++++++++++++++

Bug fixes:

- Fix a race condition in validation when concurrent threads use the
  same ``Schema`` instance (:issue:`783`). Thanks :user:`yupeng0921` and
  :user:`lafrech` for the fix.
- Fix serialization behavior of
  ``fields.List(fields.Integer(as_string=True))`` (:issue:`788`). Thanks
  :user:`cactus` for reporting and :user:`lafrech` for the fix.
- Fix behavior of ``exclude`` parameter when passed from parent to
  nested schemas (:issue:`728`). Thanks :user:`timc13` for reporting and
  :user:`deckar01` for the fix.

2.15.1 (2018-04-25)
+++++++++++++++++++

Bug fixes:

- :cve:`CVE-2018-17175`: Fix behavior when an empty list is passed as the ``only`` argument
  (:issue:`772`). Thanks :user:`deckar01` for reporting and thanks
  :user:`lafrech` for the fix.

2.15.0 (2017-12-02)
+++++++++++++++++++

Bug fixes:

- Handle ``UnicodeDecodeError`` when deserializing ``bytes`` with a
  ``String`` field (:issue:`650`). Thanks :user:`dan-blanchard` for the
  suggestion and thanks :user:`4lissonsilveira` for the PR.

2.14.0 (2017-10-23)
+++++++++++++++++++

Features:

- Add ``require_tld`` parameter to ``validate.URL`` (:issue:`664`).
  Thanks :user:`sduthil` for the suggestion and the PR.

2.13.6 (2017-08-16)
+++++++++++++++++++

Bug fixes:

- Fix serialization of types that implement `__getitem__`
  (:issue:`669`). Thanks :user:`MichalKononenko`.

2.13.5 (2017-04-12)
+++++++++++++++++++

Bug fixes:

- Fix validation of iso8601-formatted dates (:issue:`556`). Thanks :user:`lafrech` for reporting.

2.13.4 (2017-03-19)
+++++++++++++++++++

Bug fixes:

- Fix symmetry of serialization and deserialization behavior when passing a dot-delimited path to the ``attribute`` parameter of fields (:issue:`450`). Thanks :user:`itajaja` for reporting.

2.13.3 (2017-03-11)
+++++++++++++++++++

Bug fixes:

- Restore backwards-compatibility of ``SchemaOpts`` constructor (:issue:`597`). Thanks :user:`Wesmania` for reporting and thanks :user:`frol` for the fix.

2.13.2 (2017-03-10)
+++++++++++++++++++

Bug fixes:

- Fix inheritance of ``ordered`` option when ``Schema`` subclasses define ``class Meta`` (:issue:`593`). Thanks :user:`frol`.

Support:

- Update contributing docs.

2.13.1 (2017-03-04)
+++++++++++++++++++

Bug fixes:

- Fix sorting on Schema subclasses when ``ordered=True`` (:issue:`592`). Thanks :user:`frol`.

2.13.0 (2017-02-18)
+++++++++++++++++++

Features:

- Minor optimizations (:issue:`577`). Thanks :user:`rowillia` for the PR.

2.12.2 (2017-01-30)
+++++++++++++++++++

Bug fixes:

- Unbound fields return `None` rather returning the field itself. This fixes a corner case introduced in :issue:`572`. Thanks :user:`touilleMan` for reporting and :user:`YuriHeupa` for the fix.

2.12.1 (2017-01-23)
+++++++++++++++++++

Bug fixes:

- Fix behavior when a ``Nested`` field is composed within a ``List`` field (:issue:`572`). Thanks :user:`avish` for reporting and :user:`YuriHeupa` for the PR.

2.12.0 (2017-01-22)
+++++++++++++++++++

Features:

- Allow passing nested attributes (e.g. ``'child.field'``) to the ``dump_only`` and ``load_only`` parameters of ``Schema`` (:issue:`572`). Thanks :user:`YuriHeupa` for the PR.
- Add ``schemes`` parameter to ``fields.URL`` (:issue:`574`). Thanks :user:`mosquito` for the PR.

2.11.1 (2017-01-08)
+++++++++++++++++++

Bug fixes:

- Allow ``strict`` class Meta option to be overriden by constructor (:issue:`550`). Thanks :user:`douglas-treadwell` for reporting and thanks :user:`podhmo` for the PR.

2.11.0 (2017-01-08)
+++++++++++++++++++

Features:

- Import ``marshmallow.fields`` in ``marshmallow/__init__.py`` to save an import when importing the ``marshmallow`` module (:issue:`557`). Thanks :user:`mindojo-victor`.

Support:

- Documentation: Improve example in "Validating Original Input Data" (:issue:`558`). Thanks :user:`altaurog`.
- Test against Python 3.6.

2.10.5 (2016-12-19)
+++++++++++++++++++

Bug fixes:

- Reset user-defined kwargs passed to ``ValidationError`` on each ``Schema.load`` call (:issue:`565`). Thanks :user:`jbasko` for the catch and patch.

Support:

- Tests: Fix redefinition of ``test_utils.test_get_value()`` (:issue:`562`). Thanks :user:`nelfin`.

2.10.4 (2016-11-18)
+++++++++++++++++++

Bug fixes:

- `Function` field works with callables that use Python 3 type annotations (:issue:`540`). Thanks :user:`martinstein` for reporting and thanks :user:`sabinem`, :user:`lafrech`, and :user:`maximkulkin` for the work on the PR.

2.10.3 (2016-10-02)
+++++++++++++++++++

Bug fixes:

- Fix behavior for serializing missing data with ``Number`` fields when ``as_string=True`` is passed (:issue:`538`). Thanks :user:`jessemyers` for reporting.

2.10.2 (2016-09-25)
+++++++++++++++++++

Bug fixes:

- Use fixed-point notation rather than engineering notation when serializing with ``Decimal`` (:issue:`534`). Thanks :user:`gdub`.
- Fix UUID validation on serialization and deserialization of ``uuid.UUID`` objects (:issue:`532`). Thanks :user:`pauljz`.

2.10.1 (2016-09-14)
+++++++++++++++++++

Bug fixes:

- Fix behavior when using ``validate.Equal(False)`` (:issue:`484`). Thanks :user:`pktangyue` for reporting and thanks :user:`tuukkamustonen` for the fix.
- Fix ``strict`` behavior when errors are raised in ``pre_dump``/``post_dump`` processors (:issue:`521`). Thanks :user:`tvuotila` for the catch and patch.
- Fix validation of nested fields on dumping (:issue:`528`). Thanks again :user:`tvuotila`.

2.10.0 (2016-09-05)
+++++++++++++++++++

Features:

- Errors raised by pre/post-load/dump methods will be added to a schema's errors dictionary (:issue:`472`). Thanks :user:`dbertouille` for the suggestion and for the PR.

2.9.1 (2016-07-21)
++++++++++++++++++

Bug fixes:

- Fix serialization of ``datetime.time`` objects with microseconds (:issue:`464`). Thanks :user:`Tim-Erwin` for reporting and thanks :user:`vuonghv` for the fix.
- Make ``@validates`` consistent with field validator behavior: if validation fails, the field will not be included in the deserialized output (:issue:`391`). Thanks :user:`martinstein` for reporting and thanks :user:`vuonghv` for the fix.

2.9.0 (2016-07-06)
++++++++++++++++++

- ``Decimal`` field coerces input values to a string before deserializing to a `decimal.Decimal` object in order to avoid transformation of float values under 12 significant digits (:issue:`434`, :issue:`435`). Thanks :user:`davidthornton` for the PR.

2.8.0 (2016-06-23)
++++++++++++++++++

Features:

- Allow ``only`` and ``exclude`` parameters to take nested fields, using dot-delimited syntax (e.g. ``only=['blog.author.email']``) (:issue:`402`). Thanks :user:`Tim-Erwin` and :user:`deckar01` for the discussion and implementation.

Support:

- Update tasks.py for compatibility with invoke>=0.13.0. Thanks :user:`deckar01`.

2.7.3 (2016-05-05)
++++++++++++++++++

- Make ``field.parent`` and ``field.name`` accessible to ``on_bind_field`` (:issue:`449`). Thanks :user:`immerrr`.

2.7.2 (2016-04-27)
++++++++++++++++++

No code changes in this release. This is a reupload in order to distribute an sdist for the last hotfix release. See :issue:`443`.

Support:

- Update license entry in setup.py to fix RPM distributions (:issue:`433`). Thanks :user:`rrajaravi` for reporting.

2.7.1 (2016-04-08)
++++++++++++++++++

Bug fixes:

- Only add Schemas to class registry if a class name is provided. This allows Schemas to be
  constructed dynamically using the ``type`` constructor without getting added to the class registry (which is useful for saving memory).

2.7.0 (2016-04-04)
++++++++++++++++++

Features:

- Make context available to ``Nested`` field's ``on_bind_field`` method (:issue:`408`). Thanks :user:`immerrr` for the PR.
- Pass through user ``ValidationError`` kwargs (:issue:`418`). Thanks :user:`russelldavies` for helping implement this.

Other changes:

- Remove unused attributes ``root``, ``parent``, and ``name`` from ``SchemaABC`` (:issue:`410`). Thanks :user:`Tim-Erwin` for the PR.

2.6.1 (2016-03-17)
++++++++++++++++++

Bug fixes:

- Respect `load_from` when reporting errors for nested required fields (:issue:`414`). Thanks :user:`yumike`.

2.6.0 (2016-02-01)
++++++++++++++++++

Features:

- Add ``partial`` argument to ``Schema.validate`` (:issue:`379`). Thanks :user:`tdevelioglu` for the PR.
- Add ``equal`` argument to ``validate.Length``. Thanks :user:`daniloakamine`.
- Collect all validation errors for each item deserialized by a ``List`` field (:issue:`345`). Thanks :user:`maximkulkin` for the report and the PR.

2.5.0 (2016-01-16)
++++++++++++++++++

Features:

- Allow a tuple of field names to be passed as the ``partial`` argument to ``Schema.load`` (:issue:`369`). Thanks :user:`tdevelioglu` for the PR.
- Add ``schemes`` argument to ``validate.URL`` (:issue:`356`).

2.4.2 (2015-12-08)
++++++++++++++++++

Bug fixes:

- Prevent duplicate error messages when validating nested collections (:issue:`360`). Thanks :user:`alexmorken` for the catch and patch.

2.4.1 (2015-12-07)
++++++++++++++++++

Bug fixes:

- Serializing an iterator will not drop the first item (:issue:`343`, :issue:`353`). Thanks :user:`jmcarp` for the patch. Thanks :user:`edgarallang` and :user:`jmcarp` for reporting.

2.4.0 (2015-12-06)
++++++++++++++++++

Features:

- Add ``skip_on_field_errors`` parameter to ``validates_schema`` (:issue:`323`). Thanks :user:`jjvattamattom` for the suggestion and :user:`d-sutherland` for the PR.

Bug fixes:

- Fix ``FormattedString`` serialization (:issue:`348`). Thanks :user:`acaird` for reporting.
- Fix ``@validates`` behavior when used when ``attribute`` is specified and ``strict=True`` (:issue:`350`). Thanks :user:`density` for reporting.

2.3.0 (2015-11-22)
++++++++++++++++++

Features:

- Add ``dump_to`` parameter to fields (:issue:`310`). Thanks :user:`ShayanArmanPercolate` for the suggestion. Thanks :user:`franciscod` and :user:`ewang` for the PRs.
- The ``deserialize`` function passed to ``fields.Function`` can optionally receive a ``context`` argument (:issue:`324`). Thanks :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Function`` is optional (:issue:`325`). Thanks again :user:`DamianHeard`.
- The ``serialize`` function passed to ``fields.Method`` is optional (:issue:`329`). Thanks :user:`justanr`.

Deprecation/Removal:

- The ``func`` argument of ``fields.Function`` has been renamed to ``serialize``.
- The ``method_name`` argument of ``fields.Method`` has been renamed to ``serialize``.

``func`` and ``method_name`` are still present for backwards-compatibility, but they will both be removed in marshmallow 3.0.

2.2.1 (2015-11-11)
++++++++++++++++++

Bug fixes:

- Skip field validators for fields that aren't included in ``only`` (:issue:`320`). Thanks :user:`carlos-alberto` for reporting and :user:`eprikazc` for the PR.

2.2.0 (2015-10-26)
++++++++++++++++++

Features:

- Add support for partial deserialization with the ``partial`` argument to ``Schema`` and ``Schema.load`` (:issue:`290`). Thanks :user:`taion`.

Deprecation/Removals:

- ``Query`` and ``QuerySelect`` fields are removed.
- Passing of strings to ``required`` and ``allow_none`` is removed. Pass the ``error_messages`` argument instead.

Support:

- Add example of Schema inheritance in docs (:issue:`225`). Thanks :user:`martinstein` for the suggestion and :user:`juanrossi` for the PR.
- Add "Customizing Error Messages" section to custom fields docs.

2.1.3 (2015-10-18)
++++++++++++++++++

Bug fixes:

- Fix serialization of collections for which `iter` will modify position, e.g. Pymongo cursors (:issue:`303`). Thanks :user:`Mise` for the catch and patch.

2.1.2 (2015-10-14)
++++++++++++++++++

Bug fixes:

- Fix passing data to schema validator when using ``@validates_schema(many=True)`` (:issue:`297`). Thanks :user:`d-sutherland` for reporting.
- Fix usage of ``@validates`` with a nested field when ``many=True`` (:issue:`298`). Thanks :user:`nelfin` for the catch and patch.

2.1.1 (2015-10-07)
++++++++++++++++++

Bug fixes:

- ``Constant`` field deserializes to its value regardless of whether its field name is present in input data (:issue:`291`). Thanks :user:`fayazkhan` for reporting.

2.1.0 (2015-09-30)
++++++++++++++++++

Features:

- Add ``Dict`` field for arbitrary mapping data (:issue:`251`). Thanks :user:`dwieeb` for adding this and :user:`Dowwie` for the suggestion.
- Add ``Field.root`` property, which references the field's Schema.

Deprecation/Removals:

- The ``extra`` param of ``Schema`` is deprecated. Add extra data in a ``post_load`` method instead.
- ``UnmarshallingError`` and ``MarshallingError`` are removed.

Bug fixes:

- Fix storing multiple schema-level validation errors (:issue:`287`). Thanks :user:`evgeny-sureev` for the patch.
- If ``missing=None`` on a field, ``allow_none`` will be set to ``True``.

Other changes:

- A ``List's`` inner field will have the list field set as its parent. Use ``root`` to access the ``Schema``.

2.0.0 (2015-09-25)
++++++++++++++++++

Features:

- Make error messages configurable at the class level and instance level (``Field.default_error_messages`` attribute and ``error_messages`` parameter, respectively).

Deprecation/Removals:

- Remove ``make_object``. Use a ``post_load`` method instead (:issue:`277`).
- Remove the ``error`` parameter and attribute of ``Field``.
- Passing string arguments to ``required`` and ``allow_none`` is deprecated. Pass the ``error_messages`` argument instead. **This API will be removed in version 2.2**.
- Remove ``Arbitrary``, ``Fixed``, and ``Price`` fields (:issue:`86`). Use ``Decimal`` instead.
- Remove ``Select`` / ``Enum`` fields (:issue:`135`). Use the ``OneOf`` validator instead.

Bug fixes:

- Fix error format for ``Nested`` fields when ``many=True``. Thanks :user:`alexmorken`.
- ``pre_dump`` methods are invoked before implicit field creation. Thanks :user:`makmanalp` for reporting.
- Return correct "required" error message for ``Nested`` field.
- The ``only`` argument passed to a ``Schema`` is bounded by the ``fields`` option (:issue:`183`). Thanks :user:`lustdante` for the suggestion.

Changes from 2.0.0rc2:

- ``error_handler`` and ``accessor`` options are replaced with the ``handle_error`` and ``get_attribute`` methods :issue:`284`.
- Remove ``marshmallow.compat.plain_function`` since it is no longer used.
- Non-collection values are invalid input for ``List`` field (:issue:`231`). Thanks :user:`density` for reporting.
- Bug fix: Prevent infinite loop when validating a required, self-nested field. Thanks :user:`Bachmann1234` for the fix.

2.0.0rc2 (2015-09-16)
+++++++++++++++++++++

Deprecation/Removals:

- ``make_object`` is deprecated. Use a ``post_load`` method instead (:issue:`277`). **This method will be removed in the final 2.0 release**.
- ``Schema.accessor`` and ``Schema.error_handler`` decorators are deprecated. Define the ``accessor`` and ``error_handler`` class Meta options instead.

Bug fixes:

- Allow non-field names to be passed to ``ValidationError`` (:issue:`273`). Thanks :user:`evgeny-sureev` for the catch and patch.

Changes from 2.0.0rc1:

- The ``raw`` parameter of the ``pre_*``, ``post_*``, ``validates_schema`` decorators was renamed to ``pass_many`` (:issue:`276`).
- Add ``pass_original`` parameter to ``post_load`` and ``post_dump`` (:issue:`216`).
- Methods decorated with the ``pre_*``, ``post_*``, and ``validates_*`` decorators must be instance methods. Class methods and instance methods are not supported at this time.

2.0.0rc1 (2015-09-13)
+++++++++++++++++++++

Features:

- *Backwards-incompatible*: ``fields.Field._deserialize`` now takes ``attr`` and ``data`` as arguments (:issue:`172`). Thanks :user:`alexmic` and :user:`kevinastone` for the suggestion.
- Allow a ``Field's`` ``attribute`` to be modified during deserialization (:issue:`266`). Thanks :user:`floqqi`.
- Allow partially-valid data to be returned for ``Nested`` fields (:issue:`269`). Thanks :user:`jomag` for the suggestion.
- Add ``Schema.on_bind_field`` hook which allows a ``Schema`` to modify its fields when they are bound.
- Stricter validation of string, boolean, and number fields (:issue:`231`). Thanks :user:`touilleMan` for the suggestion.
- Improve consistency of error messages.

Deprecation/Removals:

- ``Schema.validator``, ``Schema.preprocessor``, and ``Schema.data_handler`` are removed. Use ``validates_schema``, ``pre_load``, and ``post_dump`` instead.
- ``QuerySelect``  and ``QuerySelectList`` are deprecated (:issue:`227`). **These fields will be removed in version 2.1.**
- ``utils.get_callable_name`` is removed.

Bug fixes:

- If a date format string is passed to a ``DateTime`` field, it is always used for deserialization (:issue:`248`). Thanks :user:`bartaelterman` and :user:`praveen-p`.

Support:

- Documentation: Add "Using Context" section to "Extending Schemas" page (:issue:`224`).
- Include tests and docs in release tarballs (:issue:`201`).
- Test against Python 3.5.

2.0.0b5 (2015-08-23)
++++++++++++++++++++

Features:

- If a field corresponds to a callable attribute, it will be called upon serialization. Thanks :user:`alexmorken`.
- Add ``load_only`` and ``dump_only`` class Meta options. Thanks :user:`kelvinhammond`.
- If a ``Nested`` field is required, recursively validate any required fields in the nested schema (:issue:`235`). Thanks :user:`max-orhai`.
- Improve error message if a list of dicts is not passed to a ``Nested`` field for which ``many=True``. Thanks again :user:`max-orhai`.

Bug fixes:

- `make_object` is only called after all validators and postprocessors have finished (:issue:`253`). Thanks :user:`sunsongxp` for reporting.
- If an invalid type is passed to ``Schema`` and ``strict=False``, store a ``_schema`` error in the errors dict rather than raise an exception (:issue:`261`). Thanks :user:`density` for reporting.

Other changes:

- ``make_object`` is only called when input data are completely valid (:issue:`243`). Thanks :user:`kissgyorgy` for reporting.
- Change default error messages for ``URL`` and ``Email`` validators so that they don't include user input (:issue:`255`).
- ``Email`` validator permits email addresses with non-ASCII characters, as per RFC 6530 (:issue:`221`). Thanks :user:`lextoumbourou` for reporting and :user:`mwstobo` for sending the patch.

2.0.0b4 (2015-07-07)
++++++++++++++++++++

Features:

- ``List`` field respects the ``attribute`` argument of the inner field. Thanks :user:`jmcarp`.
- The ``container`` field ``List`` field has access to its parent ``Schema`` via its ``parent`` attribute. Thanks again :user:`jmcarp`.

Deprecation/Removals:

- Legacy validator functions have been removed (:issue:`73`). Use the class-based validators in ``marshmallow.validate`` instead.

Bug fixes:

- ``fields.Nested`` correctly serializes nested ``sets`` (:issue:`233`). Thanks :user:`traut`.

Changes from 2.0.0b3:

- If ``load_from`` is used on deserialization, the value of ``load_from`` is used as the key in the errors dict (:issue:`232`). Thanks :user:`alexmorken`.

2.0.0b3 (2015-06-14)
+++++++++++++++++++++

Features:

- Add ``marshmallow.validates_schema`` decorator for defining schema-level validators (:issue:`116`).
- Add ``marshmallow.validates`` decorator for defining field validators as Schema methods (:issue:`116`). Thanks :user:`philtay`.
- Performance improvements.
- Defining ``__marshallable__`` on complex objects is no longer necessary.
- Add ``fields.Constant``. Thanks :user:`kevinastone`.

Deprecation/Removals:

- Remove ``skip_missing`` class Meta option. By default, missing inputs are excluded from serialized output (:issue:`211`).
- Remove optional ``context`` parameter that gets passed to methods for ``Method`` fields.
- ``Schema.validator`` is deprecated. Use ``marshmallow.validates_schema`` instead.
- ``utils.get_func_name`` is removed. Use ``utils.get_callable_name`` instead.

Bug fixes:

- Fix serializing values from keyed tuple types (regression of :issue:`28`). Thanks :user:`makmanalp` for reporting.

Other changes:

- Remove unnecessary call to ``utils.get_value`` for ``Function`` and ``Method`` fields (:issue:`208`). Thanks :user:`jmcarp`.
- Serializing a collection without passing ``many=True`` will not result in an error. Be very careful to pass the ``many`` argument when necessary.

Support:

- Documentation: Update Flask and Peewee examples. Update Quickstart.

Changes from 2.0.0b2:

- ``Boolean`` field serializes ``None`` to ``None``, for consistency with other fields (:issue:`213`). Thanks :user:`cmanallen` for reporting.
- Bug fix: ``load_only`` fields do not get validated during serialization.
- Implicit passing of original, raw data to Schema validators is removed. Use ``@marshmallow.validates_schema(pass_original=True)`` instead.

2.0.0b2 (2015-05-03)
++++++++++++++++++++

Features:

- Add useful ``__repr__`` methods to validators (:issue:`204`). Thanks :user:`philtay`.
- *Backwards-incompatible*: By default, ``NaN``, ``Infinity``, and ``-Infinity`` are invalid values for ``fields.Decimal``. Pass ``allow_nan=True`` to allow these values. Thanks :user:`philtay`.

Changes from 2.0.0b1:

- Fix serialization of ``None`` for `Time`, `TimeDelta`, and `Date` fields (a regression introduced in 2.0.0a1).

Includes bug fixes from 1.2.6.

2.0.0b1 (2015-04-26)
++++++++++++++++++++

Features:

- Errored fields will not appear in (de)serialized output dictionaries (:issue:`153`, :issue:`202`).
- Instantiate ``OPTIONS_CLASS`` in ``SchemaMeta``. This makes ``Schema.opts`` available in metaclass methods. It also causes validation to occur earlier (upon ``Schema`` class declaration rather than instantiation).
- Add ``SchemaMeta.get_declared_fields`` class method to support adding additional declared fields.

Deprecation/Removals:

- Remove ``allow_null`` parameter of ``fields.Nested`` (:issue:`203`).

Changes from 2.0.0a1:

- Fix serialization of `None` for ``fields.Email``.

2.0.0a1 (2015-04-25)
++++++++++++++++++++

Features:

- *Backwards-incompatible*: When ``many=True``, the errors dictionary returned by ``dump`` and ``load`` will be keyed on the indices of invalid items in the (de)serialized collection (:issue:`75`). Add ``index_errors=False`` on a Schema's ``class Meta`` options to disable this behavior.
- *Backwards-incompatible*: By default, fields will raise a ValidationError if the input is ``None``. The ``allow_none`` parameter can override this behavior.
- *Backwards-incompatible*: A ``Field's`` ``default`` parameter is only used if explicitly set and the field's value is missing in the input to `Schema.dump`. If not set, the key will not be present in the serialized output for missing values . This is the behavior for *all* fields. ``fields.Str`` no longer defaults to ``''``, ``fields.Int`` no longer defaults to ``0``, etc. (:issue:`199`). Thanks :user:`jmcarp` for the feedback.
- In ``strict`` mode, a ``ValidationError`` is raised. Error messages are accessed via the ``ValidationError's`` ``messages`` attribute (:issue:`128`).
- Add ``allow_none`` parameter to ``fields.Field``. If ``False`` (the default), validation fails when the field's value is ``None`` (:issue:`76`, :issue:`111`). If ``allow_none`` is ``True``, ``None`` is considered valid and will deserialize to ``None``.
- Schema-level validators can store error messages for multiple fields (:issue:`118`). Thanks :user:`ksesong` for the suggestion.
- Add ``pre_load``, ``post_load``, ``pre_dump``, and ``post_dump`` Schema method decorators for defining pre- and post- processing routines (:issue:`153`, :issue:`179`). Thanks :user:`davidism`, :user:`taion`, and :user:`jmcarp` for the suggestions and feedback. Thanks :user:`taion` for the implementation.
- Error message for ``required`` validation is configurable. (:issue:`78`). Thanks :user:`svenstaro` for the suggestion. Thanks :user:`0xDCA` for the implementation.
- Add ``load_from`` parameter to fields (:issue:`125`). Thanks :user:`hakjoon`.
- Add ``load_only`` and ``dump_only`` parameters to fields (:issue:`61`, :issue:`87`). Thanks :user:`philtay`.
- Add `missing` parameter to fields (:issue:`115`). Thanks :user:`philtay`.
- Schema validators can take an optional ``raw_data`` argument which contains raw input data, incl. data not specified in the schema (:issue:`127`). Thanks :user:`ryanlowe0`.
- Add ``validate.OneOf`` (:issue:`135`) and ``validate.ContainsOnly`` (:issue:`149`) validators. Thanks :user:`philtay`.
- Error messages for validators can be interpolated with `{input}` and other values (depending on the validator).
- ``fields.TimeDelta`` always serializes to an integer value in order to avoid rounding errors (:issue:`105`). Thanks :user:`philtay`.
- Add ``include`` class Meta option to support field names which are Python keywords (:issue:`139`). Thanks :user:`nickretallack` for the suggestion.
- ``exclude`` parameter is respected when used together with ``only`` parameter (:issue:`165`). Thanks :user:`lustdante` for the catch and patch.
- ``fields.List`` works as expected with generators and sets (:issue:`185`). Thanks :user:`sergey-aganezov-jr`.

Deprecation/Removals:

- ``MarshallingError`` and ``UnmarshallingError`` error are deprecated in favor of a single ``ValidationError`` (:issue:`160`).
- ``context`` argument passed to Method fields is deprecated. Use ``self.context`` instead (:issue:`184`).
- Remove ``ForcedError``.
- Remove support for generator functions that yield validators (:issue:`74`). Plain generators of validators are still supported.
- The ``Select/Enum`` field is deprecated in favor of using `validate.OneOf` validator (:issue:`135`).
- Remove legacy, pre-1.0 API (``Schema.data`` and ``Schema.errors`` properties) (:issue:`73`).
- Remove ``null`` value.

Other changes:

- ``Marshaller``, ``Unmarshaller`` were moved to ``marshmallow.marshalling``. These should be considered private API (:issue:`129`).
- Make ``allow_null=True`` the default for ``Nested`` fields. This will make ``None`` serialize to ``None`` rather than a dictionary with empty values (:issue:`132`). Thanks :user:`nickrellack` for the suggestion.

1.2.6 (2015-05-03)
++++++++++++++++++

Bug fixes:

- Fix validation error message for ``fields.Decimal``.
- Allow error message for ``fields.Boolean`` to be customized with the ``error`` parameter (like other fields).

1.2.5 (2015-04-25)
++++++++++++++++++

Bug fixes:

- Fix validation of invalid types passed to a ``Nested`` field when ``many=True`` (:issue:`188`). Thanks :user:`juanrossi` for reporting.

Support:

- Fix pep8 dev dependency for flake8. Thanks :user:`taion`.

1.2.4 (2015-03-22)
++++++++++++++++++

Bug fixes:

- Fix behavior of ``as_string`` on ``fields.Integer`` (:issue:`173`). Thanks :user:`taion` for the catch and patch.

Other changes:

- Remove dead code from ``fields.Field``. Thanks :user:`taion`.

Support:

- Correction to ``_postprocess`` method in docs. Thanks again :user:`taion`.

1.2.3 (2015-03-15)
++++++++++++++++++

Bug fixes:

- Fix inheritance of ``ordered`` class Meta option (:issue:`162`). Thanks :user:`stephenfin` for reporting.

1.2.2 (2015-02-23)
++++++++++++++++++

Bug fixes:

- Fix behavior of ``skip_missing`` and ``accessor`` options when ``many=True`` (:issue:`137`). Thanks :user:`3rdcycle`.
- Fix bug that could cause an ``AttributeError`` when nesting schemas with schema-level validators (:issue:`144`). Thanks :user:`vovanbo` for reporting.

1.2.1 (2015-01-11)
++++++++++++++++++

Bug fixes:

- A ``Schema's`` ``error_handler``--if defined--will execute if ``Schema.validate`` returns validation errors (:issue:`121`).
- Deserializing `None` returns `None` rather than raising an ``AttributeError`` (:issue:`123`). Thanks :user:`RealSalmon` for the catch and patch.

1.2.0 (2014-12-22)
++++++++++++++++++

Features:

- Add ``QuerySelect`` and ``QuerySelectList`` fields (:issue:`84`).
- Convert validators in ``marshmallow.validate`` into class-based callables to make them easier to use when declaring fields (:issue:`85`).
- Add ``Decimal`` field which is safe to use when dealing with precise numbers (:issue:`86`).

Thanks :user:`philtay` for these contributions.

Bug fixes:

- ``Date`` fields correctly deserializes to a ``datetime.date`` object when ``python-dateutil`` is not installed (:issue:`79`). Thanks :user:`malexer` for the catch and patch.
- Fix bug that raised an ``AttributeError`` when using a class-based validator.
- Fix ``as_string`` behavior of Number fields when serializing to default value.
- Deserializing ``None`` or the empty string with either a ``DateTime``, ``Date``, ``Time`` or ``TimeDelta`` results in the correct unmarshalling errors (:issue:`96`). Thanks :user:`svenstaro` for reporting and helping with this.
- Fix error handling when deserializing invalid UUIDs (:issue:`106`). Thanks :user:`vesauimonen` for the catch and patch.
- ``Schema.loads`` correctly defaults to use the value of ``self.many`` rather than defaulting to ``False`` (:issue:`108`). Thanks :user:`davidism` for the catch and patch.
- Validators, data handlers, and preprocessors are no longer shared between schema subclasses (:issue:`88`). Thanks :user:`amikholap` for reporting.
- Fix error handling when passing a ``dict`` or ``list`` to a ``ValidationError`` (:issue:`110`). Thanks :user:`ksesong` for reporting.

Deprecation:

- The validator functions in the ``validate`` module are deprecated in favor of the class-based validators (:issue:`85`).
- The ``Arbitrary``, ``Price``, and ``Fixed`` fields are deprecated in favor of the ``Decimal`` field (:issue:`86`).

Support:

- Update docs theme.
- Update contributing docs (:issue:`77`).
- Fix namespacing example in "Extending Schema" docs. Thanks :user:`Ch00k`.
- Exclude virtualenv directories from syntax checking (:issue:`99`). Thanks :user:`svenstaro`.


1.1.0 (2014-12-02)
++++++++++++++++++

Features:

- Add ``Schema.validate`` method which validates input data against a schema. Similar to ``Schema.load``, but does not call ``make_object`` and only returns the errors dictionary.
- Add several validation functions to the ``validate`` module. Thanks :user:`philtay`.
- Store field name and instance on exceptions raised in ``strict`` mode.

Bug fixes:

- Fix serializing dictionaries when field names are methods of ``dict`` (e.g. ``"items"``). Thanks :user:`rozenm` for reporting.
- If a Nested field is passed ``many=True``, ``None`` serializes to an empty list. Thanks :user:`nickretallack` for reporting.
- Fix behavior of ``many`` argument passed to ``dump`` and ``load``. Thanks :user:`svenstaro` for reporting and helping with this.
- Fix ``skip_missing`` behavior for ``String`` and ``List`` fields. Thanks :user:`malexer` for reporting.
- Fix compatibility with python-dateutil 2.3.
- More consistent error messages across DateTime, TimeDelta, Date, and Time fields.

Support:

- Update Flask and Peewee examples.

1.0.1 (2014-11-18)
++++++++++++++++++

Hotfix release.

- Ensure that errors dictionary is correctly cleared on each call to Schema.dump and Schema.load.

1.0.0 (2014-11-16)
++++++++++++++++++

Adds new features, speed improvements, better error handling, and updated documentation.

- Add ``skip_missing`` ``class Meta`` option.
- A field's ``default`` may be a callable.
- Allow accessor function to be configured via the ``Schema.accessor`` decorator or the ``__accessor__`` class member.
- ``URL`` and ``Email`` fields are validated upon serialization.
- ``dump`` and ``load`` can receive the ``many`` argument.
- Move a number of utility functions from fields.py to utils.py.
- More useful ``repr`` for ``Field`` classes.
- If a field's default is ``fields.missing`` and its serialized value is ``None``, it will not be included in the final serialized result.
- Schema.dumps no longer coerces its result to a binary string on Python 3.
- *Backwards-incompatible*: Schema output is no longer an ``OrderedDict`` by default. If you want ordered field output, you must explicitly set the ``ordered`` option to ``True``.
- *Backwards-incompatible*: `error` parameter of the `Field` constructor is deprecated. Raise a `ValidationError` instead.
- Expanded test coverage.
- Updated docs.

1.0.0-a (2014-10-19)
++++++++++++++++++++

Major reworking and simplification of the public API, centered around support for deserialization, improved validation, and a less stateful ``Schema`` class.

* Rename ``Serializer`` to ``Schema``.
* Support for deserialization.
* Use the ``Schema.dump`` and ``Schema.load`` methods for serializing and deserializing, respectively.
* *Backwards-incompatible*: Remove ``Serializer.json`` and ``Serializer.to_json``. Use ``Schema.dumps`` instead.
* Reworked fields interface.
* *Backwards-incompatible*: ``Field`` classes implement ``_serialize`` and ``_deserialize`` methods. ``serialize`` and ``deserialize`` comprise the public API for a ``Field``. ``Field.format`` and ``Field.output`` have been removed.
* Add ``exceptions.ForcedError`` which allows errors to be raised during serialization (instead of storing errors in the ``errors`` dict).
* *Backwards-incompatible*: ``DateTime`` field serializes to ISO8601 format by default (instead of RFC822).
* *Backwards-incompatible*: Remove ``Serializer.factory`` method. It is no longer necessary with the ``dump`` method.
* *Backwards-incompatible*: Allow nesting a serializer within itself recursively. Use ``exclude`` or ``only`` to prevent infinite recursion.
* *Backwards-incompatible*: Multiple errors can be stored for a single field. The errors dictionary returned by ``load`` and ``dump`` have lists of error messages keyed by field name.
* Remove ``validated`` decorator. Validation occurs within ``Field`` methods.
* ``Function`` field raises a ``ValueError`` if an uncallable object is passed to its constructor.
* ``Nested`` fields inherit context from their parent.
* Add ``Schema.preprocessor`` and ``Schema.validator`` decorators for registering preprocessing and schema-level validation functions respectively.
* Custom error messages can be specified by raising a ``ValidationError`` within a validation function.
* Extra keyword arguments passed to a Field are stored as metadata.
* Fix ordering of field output.
* Fix behavior of the ``required`` parameter on ``Nested`` fields.
* Fix serializing keyed tuple types (e.g. ``namedtuple``) with ``class Meta`` options.
* Fix default value for ``Fixed`` and ``Price`` fields.
* Fix serialization of binary strings.
* ``Schemas`` can inherit fields from non-``Schema`` base classes (e.g. mixins). Also, fields are inherited according to the MRO (rather than recursing over base classes). Thanks :user:`jmcarp`.
* Add ``Str``, ``Bool``, and ``Int`` field class aliases.

0.7.0 (2014-06-22)
++++++++++++++++++

* Add ``Serializer.error_handler`` decorator that registers a custom error handler.
* Add ``Serializer.data_handler`` decorator that registers data post-processing callbacks.
* *Backwards-incompatible*: ``process_data`` method is deprecated. Use the ``data_handler`` decorator instead.
* Fix bug that raised error when passing ``extra`` data together with ``many=True``. Thanks :user:`buttsicles` for reporting.
* If ``required=True`` validation is violated for a given ``Field``, it will raise an error message that is different from the message specified by the ``error`` argument. Thanks :user:`asteinlein`.
* More generic error message raised when required field is missing.
* ``validated`` decorator should only wrap a ``Field`` class's ``output`` method.

0.6.0 (2014-06-03)
++++++++++++++++++

* Fix bug in serializing keyed tuple types, e.g. ``namedtuple`` and ``KeyedTuple``.
* Nested field can load a serializer by its class name as a string. This makes it easier to implement 2-way nesting.
* Make Serializer.data override-able.

0.5.5 (2014-05-02)
++++++++++++++++++

* Add ``Serializer.factory`` for creating a factory function that returns a Serializer instance.
* ``MarshallingError`` stores its underlying exception as an instance variable. This is useful for inspecting errors.
* ``fields.Select`` is aliased to ``fields.Enum``.
* Add ``fields.__all__`` and ``marshmallow.__all__`` so that the modules can be more easily extended.
* Expose ``Serializer.OPTIONS_CLASS`` as a class variable so that options defaults can be overridden.
* Add ``Serializer.process_data`` hook that allows subclasses to manipulate the final output data.

0.5.4 (2014-04-17)
++++++++++++++++++

* Add ``json_module`` class Meta option.
* Add ``required`` option to fields . Thanks :user:`DeaconDesperado`.
* Tested on Python 3.4 and PyPy.

0.5.3 (2014-03-02)
++++++++++++++++++

* Fix ``Integer`` field default. It is now ``0`` instead of ``0.0``. Thanks :user:`kalasjocke`.
* Add ``context`` param to ``Serializer``. Allows accessing arbitrary objects in ``Function`` and ``Method`` fields.
* ``Function`` and ``Method`` fields raise ``MarshallingError`` if their argument is uncallable.


0.5.2 (2014-02-10)
++++++++++++++++++

* Enable custom field validation via the ``validate`` parameter.
* Add ``utils.from_rfc`` for parsing RFC datestring to Python datetime object.

0.5.1 (2014-02-02)
++++++++++++++++++

* Avoid unnecessary attribute access in ``utils.to_marshallable_type`` for improved performance.
* Fix RFC822 formatting for localized datetimes.

0.5.0 (2013-12-29)
++++++++++++++++++

* Can customize validation error messages by passing the ``error`` parameter to a field.
* *Backwards-incompatible*: Rename ``fields.NumberField`` -> ``fields.Number``.
* Add ``fields.Select``. Thanks :user:`ecarreras`.
* Support nesting a Serializer within itself by passing ``"self"`` into ``fields.Nested`` (only up to depth=1).
* *Backwards-incompatible*: No implicit serializing of collections. Must set ``many=True`` if serializing to a list. This ensures that marshmallow handles singular objects correctly, even if they are iterable.
* If Nested field ``only`` parameter is a field name, only return a single value for the nested object (instead of a dict) or a flat list of values.
* Improved performance and stability.

0.4.1 (2013-12-01)
++++++++++++++++++

* An object's ``__marshallable__`` method, if defined, takes precedence over ``__getitem__``.
* Generator expressions can be passed to a serializer.
* Better support for serializing list-like collections (e.g. ORM querysets).
* Other minor bugfixes.

0.4.0 (2013-11-24)
++++++++++++++++++

* Add ``additional`` `class Meta` option.
* Add ``dateformat`` `class Meta` option.
* Support for serializing UUID, date, time, and timedelta objects.
* Remove ``Serializer.to_data`` method. Just use ``Serialize.data`` property.
* String field defaults to empty string instead of ``None``.
* *Backwards-incompatible*: ``isoformat`` and ``rfcformat`` functions moved to utils.py.
* *Backwards-incompatible*: Validation functions moved to validate.py.
* *Backwards-incompatible*: Remove types.py.
* Reorder parameters to ``DateTime`` field (first parameter is dateformat).
* Ensure that ``to_json`` returns bytestrings.
* Fix bug with including an object property in ``fields`` Meta option.
* Fix bug with passing ``None`` to a serializer.

0.3.1 (2013-11-16)
++++++++++++++++++

* Fix bug with serializing dictionaries.
* Fix error raised when serializing empty list.
* Add ``only`` and ``exclude`` parameters to Serializer constructor.
* Add ``strict`` parameter and option: causes Serializer to raise an error if invalid data are passed in, rather than storing errors.
* Updated Flask + SQLA example in docs.

0.3.0 (2013-11-14)
++++++++++++++++++

* Declaring Serializers just got easier. The *class Meta* paradigm allows you to specify fields more concisely. Can specify ``fields`` and ``exclude`` options.
* Allow date formats to be changed by passing ``format`` parameter to ``DateTime`` field constructor. Can either be ``"rfc"`` (default), ``"iso"``, or a date format string.
* More useful error message when declaring fields as classes (instead of an instance, which is the correct usage).
* Rename MarshallingException -> MarshallingError.
* Rename marshmallow.core -> marshmallow.serializer.

0.2.1 (2013-11-12)
++++++++++++++++++

* Allow prefixing field names.
* Fix storing errors on Nested Serializers.
* Python 2.6 support.

0.2.0 (2013-11-11)
++++++++++++++++++

* Field-level validation.
* Add ``fields.Method``.
* Add ``fields.Function``.
* Allow binding of extra data to a serialized object by passing the ``extra`` param when initializing a ``Serializer``.
* Add ``relative`` paramater to ``fields.Url`` that allows for relative URLs.

0.1.0 (2013-11-10)
++++++++++++++++++

* First release.