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Fixed #23727 -- Inhibited the post_migrate signal when using serializ…


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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Tommy Beadle authored and timgraham committed Apr 14, 2015
1 parent 45ed19d commit d3fdaf907db6a5be4d0391532d7e65688c19e851
Showing with 46 additions and 1 deletion.
  1. +1 −0 AUTHORS
  2. +10 −1 django/test/
  3. +7 −0 docs/topics/testing/overview.txt
  4. +28 −0 tests/test_utils/
@@ -698,6 +698,7 @@ answer newbie questions, and generally made Django that much better:
Tome Cvitan <>
Tomek Paczkowski <>
Tom Insam
Tommy Beadle <>
Tom Tobin
Travis Cline <>
@@ -940,10 +940,19 @@ def _fixture_teardown(self):
# when flushing only a subset of the apps
for db_name in self._databases_names(include_mirrors=False):
# Flush the database
inhibit_post_migrate = (
self.available_apps is not None
or (
# Inhibit the post_migrate signal when using serialized
# rollback to avoid trying to recreate the serialized data.
self.serialized_rollback and
hasattr(connections[db_name], '_test_serialized_contents')
call_command('flush', verbosity=0, interactive=False,
database=db_name, reset_sequences=False,
allow_cascade=self.available_apps is not None,
inhibit_post_migrate=self.available_apps is not None)
def assertQuerysetEqual(self, qs, values, transform=repr, ordered=True, msg=None):
items =, qs)
@@ -250,6 +250,13 @@ The initial serialization is usually very quick, but if you wish to exclude
some apps from this process (and speed up test runs slightly), you may add
those apps to :setting:`TEST_NON_SERIALIZED_APPS`.
.. versionchanged:: 1.9
To prevent serialized data from being loaded twice, setting
``serialized_rollback=True`` disables the
:data:`~django.db.models.signals.post_migrate` signal when flushing the test
Other test conditions
@@ -0,0 +1,28 @@
from django.test import TransactionTestCase, mock
class TestSerializedRollbackInhibitsPostMigrate(TransactionTestCase):
TransactionTestCase._fixture_teardown() inhibits the post_migrate signal
for test classes with serialized_rollback=True.
available_apps = ['test_utils']
serialized_rollback = True
def setUp(self):
# self.available_apps must be None to test the serialized_rollback
# condition.
self.available_apps = None
def tearDown(self):
self.available_apps = ['test_utils']
def test(self, call_command):
# with a mocked call_command(), this doesn't have any effect.
'flush', interactive=False, allow_cascade=False,
reset_sequences=False, inhibit_post_migrate=True,
database='default', verbosity=0,

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