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Code Issues 32 Releases Wiki Activity

Fixed #23264: Schema backends honour db_constraint

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This commit is contained in:
Andrew Godwin
2014-08-09 17:50:00 +10:00
parent 8fe406864c
commit 27b6f28435
3 changed files with 106 additions and 6 deletions
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93
tests/schema/tests.py
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@@ -10,7 +10,7 @@ from django.db.transaction import atomic
from .models import (Author, AuthorWithM2M, Book, BookWithLongName,
BookWithSlug, BookWithM2M, Tag, TagIndexed, TagM2MTest, TagUniqueRename,
UniqueTest, Thing, TagThrough, BookWithM2MThrough, AuthorTag, AuthorWithM2MThrough,
AuthorWithEvenLongerName)
AuthorWithEvenLongerName, BookWeak)
class SchemaTests(TransactionTestCase):
@@ -27,7 +27,8 @@ class SchemaTests(TransactionTestCase):
models = [
Author, AuthorWithM2M, Book, BookWithLongName, BookWithSlug,
BookWithM2M, Tag, TagIndexed, TagM2MTest, TagUniqueRename, UniqueTest,
Thing, TagThrough, BookWithM2MThrough, AuthorWithEvenLongerName
Thing, TagThrough, BookWithM2MThrough, AuthorWithEvenLongerName,
BookWeak,
]
# Utility functions
@@ -150,6 +151,94 @@ class SchemaTests(TransactionTestCase):
else:
self.fail("No FK constraint for author_id found")
@unittest.skipUnless(connection.features.supports_foreign_keys, "No FK support")
def test_fk_db_constraint(self):
"Tests that the db_constraint parameter is respected"
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
editor.create_model(Author)
editor.create_model(BookWeak)
# Check that initial tables are there
list(Author.objects.all())
list(Tag.objects.all())
list(BookWeak.objects.all())
# Check that BookWeak doesn't have an FK constraint
constraints = self.get_constraints(BookWeak._meta.db_table)
for name, details in constraints.items():
if details['columns'] == ["author_id"] and details['foreign_key']:
self.fail("FK constraint for author_id found")
# Make a db_constraint=False FK
new_field = ForeignKey(Tag, db_constraint=False)
new_field.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.add_field(
Author,
new_field,
)
# Make sure no FK constraint is present
constraints = self.get_constraints(Author._meta.db_table)
for name, details in constraints.items():
if details['columns'] == ["tag_id"] and details['foreign_key']:
self.fail("FK constraint for tag_id found")
# Alter to one with a constraint
new_field_2 = ForeignKey(Tag)
new_field_2.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.alter_field(
Author,
new_field,
new_field_2,
strict=True,
)
# Make sure the new FK constraint is present
constraints = self.get_constraints(Author._meta.db_table)
for name, details in constraints.items():
if details['columns'] == ["tag_id"] and details['foreign_key']:
self.assertEqual(details['foreign_key'], ('schema_tag', 'id'))
break
else:
self.fail("No FK constraint for tag_id found")
# Alter to one without a constraint again
new_field_2 = ForeignKey(Tag)
new_field_2.set_attributes_from_name("tag")
with connection.schema_editor() as editor:
editor.alter_field(
Author,
new_field_2,
new_field,
strict=True,
)
# Make sure no FK constraint is present
constraints = self.get_constraints(Author._meta.db_table)
for name, details in constraints.items():
if details['columns'] == ["tag_id"] and details['foreign_key']:
self.fail("FK constraint for tag_id found")
@unittest.skipUnless(connection.features.supports_foreign_keys, "No FK support")
def test_m2m_db_constraint(self):
# Create the table
with connection.schema_editor() as editor:
editor.create_model(Tag)
editor.create_model(Author)
# Check that initial tables are there
list(Author.objects.all())
list(Tag.objects.all())
# Make a db_constraint=False FK
new_field = ManyToManyField("schema.Tag", related_name="authors", db_constraint=False)
new_field.contribute_to_class(Author, "tags")
# Add the field
with connection.schema_editor() as editor:
editor.add_field(
Author,
new_field,
)
# Make sure no FK constraint is present
constraints = self.get_constraints(new_field.rel.through._meta.db_table)
for name, details in constraints.items():
if details['columns'] == ["tag_id"] and details['foreign_key']:
self.fail("FK constraint for tag_id found")
def test_add_field(self):
"""
Tests adding fields to models