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from django.db import DatabaseError, connection
from django.db.models import Index
from django.test import TransactionTestCase, skipUnlessDBFeature
from .models import (
Article,
ArticleReporter,
CheckConstraintModel,
City,
Comment,
Country,
DbCommentModel,
District,
Reporter,
UniqueConstraintConditionModel,
)
class IntrospectionTests(TransactionTestCase):
available_apps = ["introspection"]
def test_table_names(self):
tl = connection.introspection.table_names()
self.assertEqual(tl, sorted(tl))
self.assertIn(
Reporter._meta.db_table,
tl,
"'%s' isn't in table_list()." % Reporter._meta.db_table,
)
self.assertIn(
Article._meta.db_table,
tl,
"'%s' isn't in table_list()." % Article._meta.db_table,
)
def test_django_table_names(self):
with connection.cursor() as cursor:
cursor.execute("CREATE TABLE django_ixn_test_table (id INTEGER);")
tl = connection.introspection.django_table_names()
cursor.execute("DROP TABLE django_ixn_test_table;")
self.assertNotIn(
"django_ixn_test_table",
tl,
"django_table_names() returned a non-Django table",
)
def test_django_table_names_retval_type(self):
# Table name is a list #15216
tl = connection.introspection.django_table_names(only_existing=True)
self.assertIs(type(tl), list)
tl = connection.introspection.django_table_names(only_existing=False)
self.assertIs(type(tl), list)
def test_table_names_with_views(self):
with connection.cursor() as cursor:
try:
cursor.execute(
"CREATE VIEW introspection_article_view AS SELECT headline "
"from introspection_article;"
)
except DatabaseError as e:
if "insufficient privileges" in str(e):
self.fail("The test user has no CREATE VIEW privileges")
else:
raise
try:
self.assertIn(
"introspection_article_view",
connection.introspection.table_names(include_views=True),
)
self.assertNotIn(
"introspection_article_view", connection.introspection.table_names()
)
finally:
with connection.cursor() as cursor:
cursor.execute("DROP VIEW introspection_article_view")
def test_unmanaged_through_model(self):
tables = connection.introspection.django_table_names()
self.assertNotIn(ArticleReporter._meta.db_table, tables)
def test_installed_models(self):
tables = [Article._meta.db_table, Reporter._meta.db_table]
models = connection.introspection.installed_models(tables)
self.assertEqual(models, {Article, Reporter})
def test_sequence_list(self):
sequences = connection.introspection.sequence_list()
reporter_seqs = [
seq for seq in sequences if seq["table"] == Reporter._meta.db_table
]
self.assertEqual(
len(reporter_seqs), 1, "Reporter sequence not found in sequence_list()"
)
self.assertEqual(reporter_seqs[0]["column"], "id")
def test_get_table_description_names(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, Reporter._meta.db_table
)
self.assertEqual(
[r[0] for r in desc], [f.column for f in Reporter._meta.fields]
)
def test_get_table_description_types(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, Reporter._meta.db_table
)
self.assertEqual(
[connection.introspection.get_field_type(r[1], r) for r in desc],
[
connection.features.introspected_field_types[field]
for field in (
"AutoField",
"CharField",
"CharField",
"CharField",
"BigIntegerField",
"BinaryField",
"SmallIntegerField",
"DurationField",
)
],
)
def test_get_table_description_col_lengths(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, Reporter._meta.db_table
)
self.assertEqual(
[
r[2]
for r in desc
if connection.introspection.get_field_type(r[1], r) == "CharField"
],
[30, 30, 254],
)
def test_get_table_description_nullable(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, Reporter._meta.db_table
)
nullable_by_backend = connection.features.interprets_empty_strings_as_nulls
self.assertEqual(
[r[6] for r in desc],
[
False,
nullable_by_backend,
nullable_by_backend,
nullable_by_backend,
True,
True,
False,
False,
],
)
def test_bigautofield(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, City._meta.db_table
)
self.assertIn(
connection.features.introspected_field_types["BigAutoField"],
[connection.introspection.get_field_type(r[1], r) for r in desc],
)
def test_smallautofield(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, Country._meta.db_table
)
self.assertIn(
connection.features.introspected_field_types["SmallAutoField"],
[connection.introspection.get_field_type(r[1], r) for r in desc],
)
@skipUnlessDBFeature("supports_comments")
def test_db_comments(self):
with connection.cursor() as cursor:
desc = connection.introspection.get_table_description(
cursor, DbCommentModel._meta.db_table
)
table_list = connection.introspection.get_table_list(cursor)
self.assertEqual(
["'Name' column comment"],
[field.comment for field in desc if field.name == "name"],
)
self.assertEqual(
["Custom table comment"],
[
table.comment
for table in table_list
if table.name == "introspection_dbcommentmodel"
],
)
# Regression test for #9991 - 'real' types in postgres
@skipUnlessDBFeature("has_real_datatype")
def test_postgresql_real_type(self):
with connection.cursor() as cursor:
cursor.execute("CREATE TABLE django_ixn_real_test_table (number REAL);")
desc = connection.introspection.get_table_description(
cursor, "django_ixn_real_test_table"
)
cursor.execute("DROP TABLE django_ixn_real_test_table;")
self.assertEqual(
connection.introspection.get_field_type(desc[0][1], desc[0]), "FloatField"
)
@skipUnlessDBFeature("can_introspect_foreign_keys")
def test_get_relations(self):
with connection.cursor() as cursor:
relations = connection.introspection.get_relations(
cursor, Article._meta.db_table
)
# That's {field_name: (field_name_other_table, other_table)}
expected_relations = {
"reporter_id": ("id", Reporter._meta.db_table),
"response_to_id": ("id", Article._meta.db_table),
}
self.assertEqual(relations, expected_relations)
# Removing a field shouldn't disturb get_relations (#17785)
body = Article._meta.get_field("body")
with connection.schema_editor() as editor:
editor.remove_field(Article, body)
with connection.cursor() as cursor:
relations = connection.introspection.get_relations(
cursor, Article._meta.db_table
)
with connection.schema_editor() as editor:
editor.add_field(Article, body)
self.assertEqual(relations, expected_relations)
def test_get_primary_key_column(self):
with connection.cursor() as cursor:
primary_key_column = connection.introspection.get_primary_key_column(
cursor, Article._meta.db_table
)
pk_fk_column = connection.introspection.get_primary_key_column(
cursor, District._meta.db_table
)
self.assertEqual(primary_key_column, "id")
self.assertEqual(pk_fk_column, "city_id")
def test_get_constraints_index_types(self):
with connection.cursor() as cursor:
constraints = connection.introspection.get_constraints(
cursor, Article._meta.db_table
)
index = {}
index2 = {}
for val in constraints.values():
if val["columns"] == ["headline", "pub_date"]:
index = val
if val["columns"] == [
"headline",
"response_to_id",
"pub_date",
"reporter_id",
]:
index2 = val
self.assertEqual(index["type"], Index.suffix)
self.assertEqual(index2["type"], Index.suffix)
@skipUnlessDBFeature("supports_index_column_ordering")
def test_get_constraints_indexes_orders(self):
"""
Indexes have the 'orders' key with a list of 'ASC'/'DESC' values.
"""
with connection.cursor() as cursor:
constraints = connection.introspection.get_constraints(
cursor, Article._meta.db_table
)
indexes_verified = 0
expected_columns = [
["headline", "pub_date"],
["headline", "response_to_id", "pub_date", "reporter_id"],
]
if connection.features.indexes_foreign_keys:
expected_columns += [
["reporter_id"],
["response_to_id"],
]
for val in constraints.values():
if val["index"] and not (val["primary_key"] or val["unique"]):
self.assertIn(val["columns"], expected_columns)
self.assertEqual(val["orders"], ["ASC"] * len(val["columns"]))
indexes_verified += 1
self.assertEqual(indexes_verified, len(expected_columns))
@skipUnlessDBFeature("supports_index_column_ordering", "supports_partial_indexes")
def test_get_constraints_unique_indexes_orders(self):
with connection.cursor() as cursor:
constraints = connection.introspection.get_constraints(
cursor,
UniqueConstraintConditionModel._meta.db_table,
)
self.assertIn("cond_name_without_color_uniq", constraints)
constraint = constraints["cond_name_without_color_uniq"]
self.assertIs(constraint["unique"], True)
self.assertEqual(constraint["columns"], ["name"])
self.assertEqual(constraint["orders"], ["ASC"])
def test_get_constraints(self):
def assertDetails(
details,
cols,
primary_key=False,
unique=False,
index=False,
check=False,
foreign_key=None,
):
# Different backends have different values for same constraints:
# PRIMARY KEY UNIQUE CONSTRAINT UNIQUE INDEX
# MySQL pk=1 uniq=1 idx=1 pk=0 uniq=1 idx=1 pk=0 uniq=1 idx=1
# PostgreSQL pk=1 uniq=1 idx=0 pk=0 uniq=1 idx=0 pk=0 uniq=1 idx=1
# SQLite pk=1 uniq=0 idx=0 pk=0 uniq=1 idx=0 pk=0 uniq=1 idx=1
if details["primary_key"]:
details["unique"] = True
if details["unique"]:
details["index"] = False
self.assertEqual(details["columns"], cols)
self.assertEqual(details["primary_key"], primary_key)
self.assertEqual(details["unique"], unique)
self.assertEqual(details["index"], index)
self.assertEqual(details["check"], check)
self.assertEqual(details["foreign_key"], foreign_key)
# Test custom constraints
custom_constraints = {
"article_email_pub_date_uniq",
"email_pub_date_idx",
}
with connection.cursor() as cursor:
constraints = connection.introspection.get_constraints(
cursor, Comment._meta.db_table
)
if (
connection.features.supports_column_check_constraints
and connection.features.can_introspect_check_constraints
):
constraints.update(
connection.introspection.get_constraints(
cursor, CheckConstraintModel._meta.db_table
)
)
custom_constraints.add("up_votes_gte_0_check")
assertDetails(
constraints["up_votes_gte_0_check"], ["up_votes"], check=True
)
assertDetails(
constraints["article_email_pub_date_uniq"],
["article_id", "email", "pub_date"],
unique=True,
)
assertDetails(
constraints["email_pub_date_idx"], ["email", "pub_date"], index=True
)
# Test field constraints
field_constraints = set()
for name, details in constraints.items():
if name in custom_constraints:
continue
elif details["columns"] == ["up_votes"] and details["check"]:
assertDetails(details, ["up_votes"], check=True)
field_constraints.add(name)
elif details["columns"] == ["voting_number"] and details["check"]:
assertDetails(details, ["voting_number"], check=True)
field_constraints.add(name)
elif details["columns"] == ["ref"] and details["unique"]:
assertDetails(details, ["ref"], unique=True)
field_constraints.add(name)
elif details["columns"] == ["voting_number"] and details["unique"]:
assertDetails(details, ["voting_number"], unique=True)
field_constraints.add(name)
elif details["columns"] == ["article_id"] and details["index"]:
assertDetails(details, ["article_id"], index=True)
field_constraints.add(name)
elif details["columns"] == ["id"] and details["primary_key"]:
assertDetails(details, ["id"], primary_key=True, unique=True)
field_constraints.add(name)
elif details["columns"] == ["article_id"] and details["foreign_key"]:
assertDetails(
details, ["article_id"], foreign_key=("introspection_article", "id")
)
field_constraints.add(name)
elif details["check"]:
# Some databases (e.g. Oracle) include additional check
# constraints.
field_constraints.add(name)
# All constraints are accounted for.
self.assertEqual(
constraints.keys() ^ (custom_constraints | field_constraints), set()
)
|
