[1.7.x] Fixed #23322 -- Use resolved swappable model for dependency resolution... (2da20379) · Commits · Dom Sekotill / django

django/db/migrations/autodetector.py

+13 −3

Original line number	Diff line number	Diff line
		@@ -237,9 +237,17 @@ class MigrationAutodetector(object):
		deps_satisfied = True
		operation_dependencies = set()
		for dep in operation._auto_deps:
		is_swappable_dep = False
		if dep[0] == "__setting__":
		operation_dependencies.add((dep[0], dep[1]))
		elif dep[0] != app_label:
		# We need to temporarily resolve the swappable dependency to prevent
		# circular references. While keeping the dependency checks on the
		# resolved model we still add the swappable dependencies.
		# See #23322
		resolved_app_label, resolved_object_name = getattr(settings, dep[1]).split('.')
		original_dep = dep
		dep = (resolved_app_label, resolved_object_name.lower(), dep[2], dep[3])
		is_swappable_dep = True
		if dep[0] != app_label and dep[0] != "__setting__":
		# External app dependency. See if it's not yet
		# satisfied.
		for other_operation in self.generated_operations.get(dep[0], []):
		@@ -249,7 +257,9 @@ class MigrationAutodetector(object):
		if not deps_satisfied:
		break
		else:
		if self.migrations.get(dep[0], None):
		if is_swappable_dep:
		operation_dependencies.add((original_dep[0], original_dep[1]))
		elif dep[0] in self.migrations:
		operation_dependencies.add((dep[0], self.migrations[dep[0]][-1].name))
		else:
		# If we can't find the other app, we add a first/last dependency,

tests/migrations/test_autodetector.py

+82 −0

Original line number	Diff line number	Diff line
		# -- coding: utf-8 --
		from django.conf import settings
		from django.test import TestCase, override_settings
		from django.db.migrations.autodetector import MigrationAutodetector
		from django.db.migrations.questioner import MigrationQuestioner
		@@ -1091,3 +1092,84 @@ class AutodetectorTests(TestCase):
		self.assertOperationTypes(changes, 'a', 0, ["CreateModel", "CreateModel"])
		self.assertOperationTypes(changes, 'a', 1, ["AddField"])
		self.assertOperationTypes(changes, 'b', 0, ["CreateModel", "CreateModel"])

		@override_settings(AUTH_USER_MODEL="a.Tenant")
		def test_circular_dependency_swappable(self):
		"""
		Tests that the dependency resolver knows to explicitly resolve
		swappable models (#23322)
		"""
		tenant = ModelState("a", "Tenant", [
		("id", models.AutoField(primary_key=True)),
		("primary_address", models.ForeignKey("b.Address"))],
		bases=(AbstractBaseUser, )
		)
		address = ModelState("b", "Address", [
		("id", models.AutoField(primary_key=True)),
		("tenant", models.ForeignKey(settings.AUTH_USER_MODEL)),
		])
		# Make state
		before = self.make_project_state([])
		after = self.make_project_state([address, tenant])
		autodetector = MigrationAutodetector(before, after)
		changes = autodetector._detect_changes()
		# Right number of migrations?
		self.assertNumberMigrations(changes, 'a', 2)
		self.assertNumberMigrations(changes, 'b', 1)
		self.assertOperationTypes(changes, 'a', 0, ["CreateModel"])
		self.assertOperationTypes(changes, 'a', 1, ["AddField"])
		self.assertOperationTypes(changes, 'b', 0, ["CreateModel"])
		self.assertEqual(changes['a'][0].dependencies, [])
		self.assertEqual(set(changes['a'][1].dependencies), set([('a', 'auto_1'), ('b', 'auto_1')]))
		self.assertEqual(changes['b'][0].dependencies, [('__setting__', 'AUTH_USER_MODEL')])

		@override_settings(AUTH_USER_MODEL="b.Tenant")
		def test_circular_dependency_swappable2(self):
		"""
		Tests that the dependency resolver knows to explicitly resolve
		swappable models but with the swappable not being the first migrated
		model (#23322)
		"""
		address = ModelState("a", "Address", [
		("id", models.AutoField(primary_key=True)),
		("tenant", models.ForeignKey(settings.AUTH_USER_MODEL)),
		])
		tenant = ModelState("b", "Tenant", [
		("id", models.AutoField(primary_key=True)),
		("primary_address", models.ForeignKey("a.Address"))],
		bases=(AbstractBaseUser, )
		)
		# Make state
		before = self.make_project_state([])
		after = self.make_project_state([address, tenant])
		autodetector = MigrationAutodetector(before, after)
		changes = autodetector._detect_changes()
		# Right number of migrations?
		self.assertNumberMigrations(changes, 'a', 2)
		self.assertNumberMigrations(changes, 'b', 1)
		self.assertOperationTypes(changes, 'a', 0, ["CreateModel"])
		self.assertOperationTypes(changes, 'a', 1, ["AddField"])
		self.assertOperationTypes(changes, 'b', 0, ["CreateModel"])
		self.assertEqual(changes['a'][0].dependencies, [])
		self.assertEqual(set(changes['a'][1].dependencies), set([('__setting__', 'AUTH_USER_MODEL'), ('a', 'auto_1')]))
		self.assertEqual(changes['b'][0].dependencies, [('a', 'auto_1')])

		@override_settings(AUTH_USER_MODEL="a.Person")
		def test_circular_dependency_swappable_self(self):
		"""
		Tests that the dependency resolver knows to explicitly resolve
		swappable models (#23322)
		"""
		person = ModelState("a", "Person", [
		("id", models.AutoField(primary_key=True)),
		("parent1", models.ForeignKey(settings.AUTH_USER_MODEL, related_name='children'))
		])
		# Make state
		before = self.make_project_state([])
		after = self.make_project_state([person])
		autodetector = MigrationAutodetector(before, after)
		changes = autodetector._detect_changes()
		# Right number of migrations?
		self.assertNumberMigrations(changes, 'a', 1)
		self.assertOperationTypes(changes, 'a', 0, ["CreateModel"])
		self.assertEqual(changes['a'][0].dependencies, [])