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Refs #27666 -- Ensured relationship consistency on delayed reloads.

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Delayed reloads of state models broke identity based relationships
between direct and non-direct ancestors.

Basing models.Options related objects map of model labels instead of
their identity ensured relationship consistency is maintained.

Refs #30966.

Co-authored-by: Hasan Ramezani <hasan.r67@gmail.com>
This commit is contained in:
Simon Charette 2020-04-05 01:25:59 -04:00 • committed by Mariusz Felisiak
parent e03eb8db93
commit 1d16c5d562
2 changed files with 27 additions and 2 deletions
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24
tests/migrations/test_state.py
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@ -532,6 +532,30 @@ class StateTests(SimpleTestCase):
project_state.add_model(ModelState.from_model(B))
self.assertEqual(len(project_state.apps.get_models()), 2)
def test_reload_model_relationship_consistency(self):
project_state = ProjectState()
project_state.add_model(ModelState('migrations', 'A', []))
project_state.add_model(ModelState('migrations', 'B', [
('a', models.ForeignKey('A', models.CASCADE)),
]))
project_state.add_model(ModelState('migrations', 'C', [
('b', models.ForeignKey('B', models.CASCADE)),
]))
A = project_state.apps.get_model('migrations.A')
B = project_state.apps.get_model('migrations.B')
C = project_state.apps.get_model('migrations.C')
self.assertEqual([r.related_model for r in A._meta.related_objects], [B])
self.assertEqual([r.related_model for r in B._meta.related_objects], [C])
self.assertEqual([r.related_model for r in C._meta.related_objects], [])
project_state.reload_model('migrations', 'a', delay=True)
A = project_state.apps.get_model('migrations.A')
B = project_state.apps.get_model('migrations.B')
C = project_state.apps.get_model('migrations.C')
self.assertEqual([r.related_model for r in A._meta.related_objects], [B])
self.assertEqual([r.related_model for r in B._meta.related_objects], [C])
self.assertEqual([r.related_model for r in C._meta.related_objects], [])
def test_add_relations(self):
"""
#24573 - Adding relations to existing models should reload the