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
|
from django.contrib.gis.db import models
from django.contrib.gis.tests.utils import mysql, spatialite
from django.utils.encoding import python_2_unicode_compatible
# MySQL spatial indices can't handle NULL geometries.
null_flag = not mysql
@python_2_unicode_compatible
class NamedModel(models.Model):
name = models.CharField(max_length=30)
objects = models.GeoManager()
class Meta:
abstract = True
app_label = 'geoapp'
def __str__(self):
return self.name
class Country(NamedModel):
mpoly = models.MultiPolygonField() # SRID, by default, is 4326
class City(NamedModel):
point = models.PointField()
# This is an inherited model from City
class PennsylvaniaCity(City):
county = models.CharField(max_length=30)
founded = models.DateTimeField(null=True)
# TODO: This should be implicitly inherited.
objects = models.GeoManager()
class Meta:
app_label = 'geoapp'
class State(NamedModel):
poly = models.PolygonField(null=null_flag) # Allowing NULL geometries here.
class Track(NamedModel):
line = models.LineStringField()
class Truth(models.Model):
val = models.BooleanField(default=False)
objects = models.GeoManager()
class Meta:
app_label = 'geoapp'
if not spatialite:
class Feature(NamedModel):
geom = models.GeometryField()
class MinusOneSRID(models.Model):
geom = models.PointField(srid=-1) # Minus one SRID.
objects = models.GeoManager()
class Meta:
app_label = 'geoapp'
|
