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Code Issues 25 Releases Wiki Activity

Migration autodetector now corerctly deals with proxy models

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This commit is contained in:
Andrew Godwin 2013-09-06 12:32:52 -05:00
parent a962286b74
commit 05e14e8eaf
2 changed files with 42 additions and 3 deletions
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18
django/db/migrations/autodetector.py
View File

@ -50,8 +50,20 @@ class MigrationAutodetector(object):
self.migrations = {}
old_app_cache = self.from_state.render()
new_app_cache = self.to_state.render()
# Prepare lists of old/new model keys that we care about
# (i.e. ignoring proxy ones)
old_model_keys = [
(al, mn)
for al, mn in self.from_state.models.keys()
if not old_app_cache.get_model(al, mn)._meta.proxy
]
new_model_keys = [
(al, mn)
for al, mn in self.to_state.models.keys()
if not new_app_cache.get_model(al, mn)._meta.proxy
]
# Adding models. Phase 1 is adding models with no outward relationships.
added_models = set(self.to_state.models.keys()) - set(self.from_state.models.keys())
added_models = set(new_model_keys) - set(old_model_keys)
pending_add = {}
for app_label, model_name in added_models:
model_state = self.to_state.models[app_label, model_name]
@ -130,7 +142,7 @@ class MigrationAutodetector(object):
)
self.add_dependency(app_label, other_app_label)
# Removing models
removed_models = set(self.from_state.models.keys()) - set(self.to_state.models.keys())
removed_models = set(old_model_keys) - set(new_model_keys)
for app_label, model_name in removed_models:
model_state = self.from_state.models[app_label, model_name]
self.add_to_migration(
@ -140,7 +152,7 @@ class MigrationAutodetector(object):
)
)
# Changes within models
kept_models = set(self.from_state.models.keys()).intersection(self.to_state.models.keys())
kept_models = set(old_model_keys).intersection(new_model_keys)
for app_label, model_name in kept_models:
old_model_state = self.from_state.models[app_label, model_name]
new_model_state = self.to_state.models[app_label, model_name]

27
tests/migrations/test_autodetector.py
View File

@ -16,6 +16,8 @@ class AutodetectorTests(TestCase):
author_name_longer = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=400))])
author_name_renamed = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("names", models.CharField(max_length=200))])
author_with_book = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("book", models.ForeignKey("otherapp.Book"))])
author_proxy = ModelState("testapp", "AuthorProxy", [], {"proxy": True}, ("testapp.author", ))
author_proxy_notproxy = ModelState("testapp", "AuthorProxy", [], {}, ("testapp.author", ))
other_pony = ModelState("otherapp", "Pony", [("id", models.AutoField(primary_key=True))])
other_stable = ModelState("otherapp", "Stable", [("id", models.AutoField(primary_key=True))])
third_thing = ModelState("thirdapp", "Thing", [("id", models.AutoField(primary_key=True))])
@ -272,3 +274,28 @@ class AutodetectorTests(TestCase):
self.assertEqual(action.__class__.__name__, "AlterUniqueTogether")
self.assertEqual(action.name, "book")
self.assertEqual(action.unique_together, set([("title", "author")]))
def test_proxy_ignorance(self):
"Tests that the autodetector correctly ignores proxy models"
# First, we test adding a proxy model
before = self.make_project_state([self.author_empty])
after = self.make_project_state([self.author_empty, self.author_proxy])
autodetector = MigrationAutodetector(before, after)
changes = autodetector._detect_changes()
# Right number of migrations?
self.assertEqual(len(changes), 0)
# Now, we test turning a proxy model into a non-proxy model
before = self.make_project_state([self.author_empty, self.author_proxy])
after = self.make_project_state([self.author_empty, self.author_proxy_notproxy])
autodetector = MigrationAutodetector(before, after)
changes = autodetector._detect_changes()
# Right number of migrations?
self.assertEqual(len(changes['testapp']), 1)
# Right number of actions?
migration = changes['testapp'][0]
self.assertEqual(len(migration.operations), 1)
# Right action?
action = migration.operations[0]
self.assertEqual(action.__class__.__name__, "CreateModel")
self.assertEqual(action.name, "AuthorProxy")