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Code Issues 25 Releases Wiki Activity

Fixed #22750, #22248: Model renaming now also alters field FKs

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This commit is contained in:
Andrew Godwin 2014-06-07 18:17:31 -07:00
parent 1e84d261d6
commit 4ce7a6bc84
6 changed files with 92 additions and 85 deletions
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16
django/db/migrations/autodetector.py
View File

@ -580,11 +580,21 @@ class MigrationAutodetector(object):
for app_label, model_name, field_name in sorted(self.old_field_keys.intersection(self.new_field_keys)):
# Did the field change?
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]
new_model_state = self.to_state.models[app_label, model_name]
old_field_name = self.renamed_fields.get((app_label, model_name, field_name), field_name)
old_field_dec = self.deep_deconstruct(old_model_state.get_field_by_name(old_field_name))
new_field_dec = self.deep_deconstruct(new_model_state.get_field_by_name(field_name))
old_field = self.old_apps.get_model(app_label, old_model_name)._meta.get_field_by_name(old_field_name)[0]
new_field = self.new_apps.get_model(app_label, model_name)._meta.get_field_by_name(field_name)[0]
# Implement any model renames on relations; these are handled by RenameModel
# so we need to exclude them from the comparison
if hasattr(new_field, "rel") and getattr(new_field.rel, "to", None):
rename_key = (
new_field.rel.to._meta.app_label,
new_field.rel.to._meta.object_name.lower(),
)
if rename_key in self.renamed_models:
new_field.rel.to = old_field.rel.to
old_field_dec = self.deep_deconstruct(old_field)
new_field_dec = self.deep_deconstruct(new_field)
if old_field_dec != new_field_dec:
self.add_operation(
app_label,

46
django/db/migrations/operations/models.py
View File

@ -113,9 +113,28 @@ class RenameModel(Operation):
self.new_name = new_name
def state_forwards(self, app_label, state):
# Get all of the related objects we need to repoint
apps = state.render(skip_cache=True)
model = apps.get_model(app_label, self.old_name)
related_objects = model._meta.get_all_related_objects()
related_m2m_objects = model._meta.get_all_related_many_to_many_objects()
# Rename the model
state.models[app_label, self.new_name.lower()] = state.models[app_label, self.old_name.lower()]
state.models[app_label, self.new_name.lower()].name = self.new_name
del state.models[app_label, self.old_name.lower()]
# Repoint the FKs and M2Ms pointing to us
for related_object in (related_objects + related_m2m_objects):
related_key = (
related_object.model._meta.app_label,
related_object.model._meta.object_name.lower(),
)
new_fields = []
for name, field in state.models[related_key].fields:
if name == related_object.field.name:
field = field.clone()
field.rel.to = "%s.%s" % (app_label, self.new_name)
new_fields.append((name, field))
state.models[related_key].fields = new_fields
def database_forwards(self, app_label, schema_editor, from_state, to_state):
old_apps = from_state.render()
@ -123,23 +142,30 @@ class RenameModel(Operation):
old_model = old_apps.get_model(app_label, self.old_name)
new_model = new_apps.get_model(app_label, self.new_name)
if router.allow_migrate(schema_editor.connection.alias, new_model):
# Move the main table
schema_editor.alter_db_table(
new_model,
old_model._meta.db_table,
new_model._meta.db_table,
)
# Alter the fields pointing to us
related_objects = old_model._meta.get_all_related_objects()
related_m2m_objects = old_model._meta.get_all_related_many_to_many_objects()
for related_object in (related_objects + related_m2m_objects):
to_field = new_apps.get_model(
related_object.model._meta.app_label,
related_object.model._meta.object_name.lower(),
)._meta.get_field_by_name(related_object.field.name)[0]
schema_editor.alter_field(
related_object.model,
related_object.field,
to_field,
)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
old_apps = from_state.render()
new_apps = to_state.render()
old_model = old_apps.get_model(app_label, self.new_name)
new_model = new_apps.get_model(app_label, self.old_name)
if router.allow_migrate(schema_editor.connection.alias, new_model):
schema_editor.alter_db_table(
new_model,
old_model._meta.db_table,
new_model._meta.db_table,
)
self.new_name, self.old_name = self.old_name, self.new_name
self.database_forwards(app_label, schema_editor, from_state, to_state)
self.new_name, self.old_name = self.old_name, self.new_name
def references_model(self, name, app_label=None):
return (

10
django/db/migrations/state.py
View File

@ -38,9 +38,9 @@ class ProjectState(object):
real_apps=self.real_apps,
)
def render(self, include_real=None, ignore_swappable=False):
def render(self, include_real=None, ignore_swappable=False, skip_cache=False):
"Turns the project state into actual models in a new Apps"
if self.apps is None:
if self.apps is None or skip_cache:
# Any apps in self.real_apps should have all their models included
# in the render. We don't use the original model instances as there
# are some variables that refer to the Apps object.
@ -87,7 +87,11 @@ class ProjectState(object):
))
else:
do_pending_lookups(model)
return self.apps
try:
return self.apps
finally:
if skip_cache:
self.apps = None
@classmethod
def from_apps(cls, apps):

33
tests/migrations/test_autodetector.py
View File

@ -77,9 +77,7 @@ class AutodetectorTests(TestCase):
return output
def assertNumberMigrations(self, changes, app_label, number):
if not changes.get(app_label, None):
self.fail("No migrations found for %s\n%s" % (app_label, self.repr_changes(changes)))
if len(changes[app_label]) != number:
if len(changes.get(app_label, [])) != number:
self.fail("Incorrect number of migrations (%s) for %s (expected %s)\n%s" % (
len(changes[app_label]),
app_label,
@ -285,7 +283,7 @@ class AutodetectorTests(TestCase):
changes = autodetector._detect_changes()
# Right number of migrations for model rename?
self.assertEqual(len(changes['testapp']), 1)
self.assertNumberMigrations(changes, 'testapp', 1)
# Right number of actions?
migration = changes['testapp'][0]
self.assertEqual(len(migration.operations), 1)
@ -294,17 +292,9 @@ class AutodetectorTests(TestCase):
self.assertEqual(action.__class__.__name__, "RenameModel")
self.assertEqual(action.old_name, "Author")
self.assertEqual(action.new_name, "Writer")
# Right number of migrations for related field rename?
self.assertEqual(len(changes['otherapp']), 1)
# Right number of actions?
migration = changes['otherapp'][0]
self.assertEqual(len(migration.operations), 1)
# Right action?
action = migration.operations[0]
self.assertEqual(action.__class__.__name__, "AlterField")
self.assertEqual(action.name, "author")
self.assertEqual(action.field.rel.to, "testapp.Writer")
# Now that RenameModel handles related fields too, there should be
# no AlterField for the related field.
self.assertNumberMigrations(changes, 'otherapp', 0)
def test_rename_model_with_renamed_rel_field(self):
"""
@ -316,9 +306,8 @@ class AutodetectorTests(TestCase):
after = self.make_project_state([self.author_renamed_with_book, self.book_with_field_and_author_renamed])
autodetector = MigrationAutodetector(before, after, MigrationQuestioner({"ask_rename_model": True, "ask_rename": True}))
changes = autodetector._detect_changes()
# Right number of migrations for model rename?
self.assertEqual(len(changes['testapp']), 1)
self.assertNumberMigrations(changes, 'testapp', 1)
# Right number of actions?
migration = changes['testapp'][0]
self.assertEqual(len(migration.operations), 1)
@ -327,21 +316,17 @@ class AutodetectorTests(TestCase):
self.assertEqual(action.__class__.__name__, "RenameModel")
self.assertEqual(action.old_name, "Author")
self.assertEqual(action.new_name, "Writer")
# Right number of migrations for related field rename?
self.assertEqual(len(changes['otherapp']), 1)
# Alter is already taken care of.
self.assertNumberMigrations(changes, 'otherapp', 1)
# Right number of actions?
migration = changes['otherapp'][0]
self.assertEqual(len(migration.operations), 2)
self.assertEqual(len(migration.operations), 1)
# Right actions?
action = migration.operations[0]
self.assertEqual(action.__class__.__name__, "RenameField")
self.assertEqual(action.old_name, "author")
self.assertEqual(action.new_name, "writer")
action = migration.operations[1]
self.assertEqual(action.__class__.__name__, "AlterField")
self.assertEqual(action.name, "writer")
self.assertEqual(action.field.rel.to, "testapp.Writer")
def test_fk_dependency(self):
"Tests that having a ForeignKey automatically adds a dependency"

14
tests/migrations/test_base.py
View File

@ -46,3 +46,17 @@ class MigrationTestBase(TransactionTestCase):
def assertIndexNotExists(self, table, columns):
return self.assertIndexExists(table, columns, False)
def assertFKExists(self, table, columns, to, value=True):
with connection.cursor() as cursor:
self.assertEqual(
value,
any(
c["foreign_key"] == to
for c in connection.introspection.get_constraints(cursor, table).values()
if c['columns'] == list(columns)
),
)
def assertFKNotExists(self, table, columns, to, value=True):
return self.assertFKExists(table, columns, to, False)

58
tests/migrations/test_operations.py
View File

@ -245,68 +245,36 @@ class OperationTests(MigrationTestBase):
"""
Tests the RenameModel operation.
"""
project_state = self.set_up_test_model("test_rnmo")
project_state = self.set_up_test_model("test_rnmo", related_model=True)
# Test the state alteration
operation = migrations.RenameModel("Pony", "Horse")
new_state = project_state.clone()
operation.state_forwards("test_rnmo", new_state)
self.assertNotIn(("test_rnmo", "pony"), new_state.models)
self.assertIn(("test_rnmo", "horse"), new_state.models)
# Remember, RenameModel also repoints all incoming FKs and M2Ms
self.assertEqual("test_rnmo.Horse", new_state.models["test_rnmo", "rider"].fields[1][1].rel.to)
# Test the database alteration
self.assertTableExists("test_rnmo_pony")
self.assertTableNotExists("test_rnmo_horse")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
with connection.schema_editor() as editor:
operation.database_forwards("test_rnmo", editor, project_state, new_state)
self.assertTableNotExists("test_rnmo_pony")
self.assertTableExists("test_rnmo_horse")
if connection.features.supports_foreign_keys:
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
# And test reversal
with connection.schema_editor() as editor:
operation.database_backwards("test_rnmo", editor, new_state, project_state)
self.assertTableExists("test_dlmo_pony")
self.assertTableExists("test_rnmo_pony")
self.assertTableNotExists("test_rnmo_horse")
# See #22248 - this will fail until that's fixed.
#
# def test_rename_model_with_related(self):
# """
# Tests the real-world combo of a RenameModel operation with AlterField
# for a related field.
# """
# project_state = self.set_up_test_model(
# "test_rnmowr", related_model=True)
# # Test the state alterations
# model_operation = migrations.RenameModel("Pony", "Horse")
# new_state = project_state.clone()
# model_operation.state_forwards("test_rnmowr", new_state)
# self.assertNotIn(("test_rnmowr", "pony"), new_state.models)
# self.assertIn(("test_rnmowr", "horse"), new_state.models)
# self.assertEqual(
# "Pony",
# project_state.render().get_model("test_rnmowr", "rider")
# ._meta.get_field_by_name("pony")[0].rel.to._meta.object_name)
# field_operation = migrations.AlterField(
# "Rider", "pony", models.ForeignKey("Horse"))
# field_operation.state_forwards("test_rnmowr", new_state)
# self.assertEqual(
# "Horse",
# new_state.render().get_model("test_rnmowr", "rider")
# ._meta.get_field_by_name("pony")[0].rel.to._meta.object_name)
# # Test the database alterations
# self.assertTableExists("test_rnmowr_pony")
# self.assertTableNotExists("test_rnmowr_horse")
# with connection.schema_editor() as editor:
# model_operation.database_forwards("test_rnmowr", editor, project_state, new_state)
# field_operation.database_forwards("test_rnmowr", editor, project_state, new_state)
# self.assertTableNotExists("test_rnmowr_pony")
# self.assertTableExists("test_rnmowr_horse")
# # And test reversal
# with connection.schema_editor() as editor:
# field_operation.database_backwards("test_rnmowr", editor, new_state, project_state)
# model_operation.database_backwards("test_rnmowr", editor, new_state, project_state)
# self.assertTableExists("test_rnmowr_pony")
# self.assertTableNotExists("test_rnmowr_horse")
if connection.features.supports_foreign_keys:
self.assertFKExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_pony", "id"))
self.assertFKNotExists("test_rnmo_rider", ["pony_id"], ("test_rnmo_horse", "id"))
def test_add_field(self):
"""