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When using a TransactionTestCase with serialized_rollback=True, after creating the database and running its migrations (along with emitting the post_migrate signal), the contents of the database are serialized to _test_serialized_contents. After the first test case, _fixture_teardown() would flush the tables but then the post_migrate signal would be emitted and new rows (with new PKs) would be created in the django_content_type table. Then in any subsequent test cases in a suite, _fixture_setup() attempts to deserialize the content of _test_serialized_contents, but these rows are identical to the rows already in the database except for their PKs. This causes an IntegrityError due to the unique constraint in the django_content_type table. This change made it so that in the above scenario the post_migrate signal is not emitted after flushing the tables, since it will be repopulated during fixture_setup(). |
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