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[2.0.x] Fixed #28884 -- Fixed crash on SQLite when renaming a field in a model referenced by a ManyToManyField.

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Introspected database constraints instead of relying on _meta.related_objects
to determine whether or not a table or a column is referenced on rename
operations.

This has the side effect of ignoring both db_constraint=False and virtual
fields such as GenericRelation which aren't backend by database level
constraints and thus shouldn't prevent the rename operations from being
performed in a transaction.

Regression in 095c1aaa89.

Thanks Tim for the additional tests and edits, and Mariusz for the review.

Backport of 9f7772e098 from master
This commit is contained in:
Simon Charette
2017-12-04 20:35:33 -05:00
committed by Tim Graham
parent 17987b5511
commit b40a1d774d
5 changed files with 146 additions and 21 deletions
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7
tests/migrations/test_operations.py
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@@ -722,7 +722,7 @@ class OperationTests(OperationTestBase):
project_state = self.apply_operations(app_label, project_state, operations=[
migrations.RenameModel("Pony", "Pony2"),
])
], atomic=connection.features.supports_atomic_references_rename)
Pony = project_state.apps.get_model(app_label, "Pony2")
Rider = project_state.apps.get_model(app_label, "Rider")
pony = Pony.objects.create()
@@ -1231,12 +1231,13 @@ class OperationTests(OperationTestBase):
second_state = first_state.clone()
operation = migrations.AlterModelTable(name='pony', table=None)
operation.state_forwards(app_label, second_state)
with connection.schema_editor() as editor:
atomic_rename = connection.features.supports_atomic_references_rename
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_forwards(app_label, editor, first_state, second_state)
self.assertTableExists(new_m2m_table)
self.assertTableNotExists(original_m2m_table)
# And test reversal
with connection.schema_editor() as editor:
with connection.schema_editor(atomic=atomic_rename) as editor:
operation.database_backwards(app_label, editor, second_state, first_state)
self.assertTableExists(original_m2m_table)
self.assertTableNotExists(new_m2m_table)