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[1.7.x] Fixed #22833: Autodetector not doing through mapping correctly

This commit is contained in:
Andrew Godwin 2014-06-15 12:06:48 -07:00
parent a067c61b94
commit 13aa079941
2 changed files with 20 additions and 1 deletions
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6
django/db/migrations/autodetector.py
View File

@ -127,7 +127,11 @@ class MigrationAutodetector(object):
new_model_state = self.to_state.models[app_label, model_name]
self.old_field_keys.update((app_label, model_name, x) for x, y in old_model_state.fields)
self.new_field_keys.update((app_label, model_name, x) for x, y in new_model_state.fields)
# Through model stuff
# Through model map generation
for app_label, model_name in sorted(self.old_model_keys):
old_model_name = self.renamed_models.get((app_label, model_name), model_name)
old_model_state = self.from_state.models[app_label, old_model_name]
for field_name, field in old_model_state.fields:
old_field = self.old_apps.get_model(app_label, old_model_name)._meta.get_field_by_name(field_name)[0]
if hasattr(old_field, "rel") and hasattr(old_field.rel, "through") and not old_field.rel.through._meta.auto_created:

15
tests/migrations/test_autodetector.py
View File

@ -738,6 +738,21 @@ class AutodetectorTests(TestCase):
self.assertEqual(action.__class__.__name__, "DeleteModel")
self.assertEqual(action.name, "Attribution")
def test_many_to_many_removed_before_through_model_2(self):
"""
Removing a model that contains a ManyToManyField and the
"through" model in the same change must remove
the field before the model to maintain consistency.
"""
before = self.make_project_state([self.book_with_multiple_authors_through_attribution, self.author_name, self.attribution])
after = self.make_project_state([self.author_name]) # removes both the through model and ManyToMany
autodetector = MigrationAutodetector(before, after)
changes = autodetector._detect_changes()
# Right number of migrations?
self.assertNumberMigrations(changes, 'otherapp', 1)
# Right number of actions?
self.assertOperationTypes(changes, 'otherapp', 0, ["RemoveField", "RemoveField", "RemoveField", "DeleteModel", "DeleteModel"])
def test_m2m_w_through_multistep_remove(self):
"""
A model with a m2m field that specifies a "through" model cannot be removed in the same