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Fixed #22485: Include all unmigrated apps in project state by default.

This commit is contained in:
Andrew Godwin 2014-04-30 12:25:12 -07:00
parent 24ec9538b7
commit 8f6dff372b
9 changed files with 93 additions and 55 deletions
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4
django/core/management/commands/makemigrations.py
View File

@ -54,7 +54,7 @@ class Command(BaseCommand):
# (makemigrations doesn't look at the database state).
# Also make sure the graph is built without unmigrated apps shoehorned in.
loader = MigrationLoader(connections[DEFAULT_DB_ALIAS], load=False)
loader.build_graph(ignore_unmigrated=True)
loader.build_graph()
# Before anything else, see if there's conflicting apps and drop out
# hard if there are any and they don't want to merge
@ -78,7 +78,7 @@ class Command(BaseCommand):
# Set up autodetector
autodetector = MigrationAutodetector(
loader.graph.project_state(),
loader.project_state(),
ProjectState.from_apps(apps),
InteractiveMigrationQuestioner(specified_apps=app_labels),
)

2
django/core/management/commands/migrate.py
View File

@ -135,7 +135,7 @@ class Command(BaseCommand):
self.stdout.write(" No migrations needed.")
# If there's changes that aren't in migrations yet, tell them how to fix it.
autodetector = MigrationAutodetector(
executor.loader.graph.project_state(),
executor.loader.project_state(),
ProjectState.from_apps(apps),
)
changes = autodetector.changes(graph=executor.loader.graph)

7
django/db/migrations/autodetector.py
View File

@ -50,17 +50,18 @@ class MigrationAutodetector(object):
old_apps = self.from_state.render()
new_apps = self.to_state.render()
# Prepare lists of old/new model keys that we care about
# (i.e. ignoring proxy ones)
# (i.e. ignoring proxy ones and unmigrated ones)
old_model_keys = []
for al, mn in self.from_state.models.keys():
model = old_apps.get_model(al, mn)
if not model._meta.proxy and model._meta.managed:
if not model._meta.proxy and model._meta.managed and al not in self.from_state.real_apps:
old_model_keys.append((al, mn))
new_model_keys = []
for al, mn in self.to_state.models.keys():
model = new_apps.get_model(al, mn)
if not model._meta.proxy and model._meta.managed:
if not model._meta.proxy and model._meta.managed and al not in self.to_state.real_apps:
new_model_keys.append((al, mn))
def _rel_agnostic_fields_def(fields):

8
django/db/migrations/executor.py
View File

@ -69,7 +69,7 @@ class MigrationExecutor(object):
statements = []
for migration, backwards in plan:
with self.connection.schema_editor(collect_sql=True) as schema_editor:
project_state = self.loader.graph.project_state((migration.app_label, migration.name), at_end=False)
project_state = self.loader.project_state((migration.app_label, migration.name), at_end=False)
if not backwards:
migration.apply(project_state, schema_editor, collect_sql=True)
else:
@ -90,7 +90,7 @@ class MigrationExecutor(object):
else:
# Alright, do it normally
with self.connection.schema_editor() as schema_editor:
project_state = self.loader.graph.project_state((migration.app_label, migration.name), at_end=False)
project_state = self.loader.project_state((migration.app_label, migration.name), at_end=False)
migration.apply(project_state, schema_editor)
# For replacement migrations, record individual statuses
if migration.replaces:
@ -110,7 +110,7 @@ class MigrationExecutor(object):
self.progress_callback("unapply_start", migration, fake)
if not fake:
with self.connection.schema_editor() as schema_editor:
project_state = self.loader.graph.project_state((migration.app_label, migration.name), at_end=False)
project_state = self.loader.project_state((migration.app_label, migration.name), at_end=False)
migration.unapply(project_state, schema_editor)
# For replacement migrations, record individual statuses
if migration.replaces:
@ -128,7 +128,7 @@ class MigrationExecutor(object):
tables it would create exist. This is intended only for use
on initial migrations (as it only looks for CreateModel).
"""
project_state = self.loader.graph.project_state((migration.app_label, migration.name), at_end=True)
project_state = self.loader.project_state((migration.app_label, migration.name), at_end=True)
apps = project_state.render()
for operation in migration.operations:
if isinstance(operation, migrations.CreateModel):

4
django/db/migrations/graph.py
View File

@ -121,7 +121,7 @@ class MigrationGraph(object):
def __str__(self):
return "Graph: %s nodes, %s edges" % (len(self.nodes), sum(len(x) for x in self.dependencies.values()))
def project_state(self, nodes=None, at_end=True):
def make_state(self, nodes=None, at_end=True, real_apps=None):
"""
Given a migration node or nodes, returns a complete ProjectState for it.
If at_end is False, returns the state before the migration has run.
@ -140,7 +140,7 @@ class MigrationGraph(object):
if not at_end and migration in nodes:
continue
plan.append(migration)
project_state = ProjectState()
project_state = ProjectState(real_apps=real_apps)
for node in plan:
project_state = self.nodes[node].mutate_state(project_state)
return project_state

38
django/db/migrations/loader.py
View File

@ -135,7 +135,7 @@ class MigrationLoader(object):
else:
return self.disk_migrations[results[0]]
def build_graph(self, ignore_unmigrated=False):
def build_graph(self):
"""
Builds a migration dependency graph using both the disk and database.
You'll need to rebuild the graph if you apply migrations. This isn't
@ -200,31 +200,10 @@ class MigrationLoader(object):
# even have migrations.
if parent[1] == "__first__" and parent not in self.graph:
if parent[0] in self.unmigrated_apps:
if ignore_unmigrated:
parent = None
else:
# This app isn't migrated, but something depends on it.
# We'll add a fake initial migration for it into the
# graph.
app_config = apps.get_app_config(parent[0])
ops = []
for model in app_config.get_models():
model_state = ModelState.from_model(model)
ops.append(
operations.CreateModel(
name=model_state.name,
fields=model_state.fields,
options=model_state.options,
bases=model_state.bases,
)
)
new_migration = type(
"FakeInitialMigration",
(Migration, ),
{"operations": ops},
)(parent[1], parent[0])
self.graph.add_node(parent, new_migration)
self.applied_migrations.add(parent)
# The models will get auto-added into the state, though
# so we're fine.
continue
elif parent[0] in self.migrated_apps:
parent = list(self.graph.root_nodes(parent[0]))[0]
else:
@ -246,6 +225,15 @@ class MigrationLoader(object):
seen_apps.setdefault(app_label, set()).add(migration_name)
return dict((app_label, seen_apps[app_label]) for app_label in conflicting_apps)
def project_state(self, nodes=None, at_end=True):
"""
Returns a ProjectState object representing the most recent state
that the migrations we loaded represent.
See graph.make_state for the meaning of "nodes" and "at_end"
"""
return self.graph.make_state(nodes=nodes, at_end=at_end, real_apps=list(self.unmigrated_apps))
class BadMigrationError(Exception):
"""

40
django/db/migrations/state.py
View File

@ -1,7 +1,8 @@
from django.apps import AppConfig
from django.apps.registry import Apps
from django.apps.registry import Apps, apps as global_apps
from django.db import models
from django.db.models.options import DEFAULT_NAMES, normalize_together
from django.db.models.fields.related import do_pending_lookups
from django.utils import six
from django.utils.module_loading import import_string
@ -17,9 +18,11 @@ class ProjectState(object):
app level so that cross-app FKs/etc. resolve properly.
"""
def __init__(self, models=None):
def __init__(self, models=None, real_apps=None):
self.models = models or {}
self.apps = None
# Apps to include from main registry, usually unmigrated ones
self.real_apps = real_apps or []
def add_model_state(self, model_state):
self.models[(model_state.app_label, model_state.name.lower())] = model_state
@ -27,20 +30,29 @@ class ProjectState(object):
def clone(self):
"Returns an exact copy of this ProjectState"
return ProjectState(
models=dict((k, v.clone()) for k, v in self.models.items())
models=dict((k, v.clone()) for k, v in self.models.items()),
real_apps=self.real_apps,
)
def render(self):
def render(self, include_real=None):
"Turns the project state into actual models in a new Apps"
if self.apps is None:
# 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.
real_models = []
for app_label in self.real_apps:
app = global_apps.get_app_config(app_label)
for model in app.get_models():
real_models.append(ModelState.from_model(model))
# Populate the app registry with a stub for each application.
app_labels = set(model_state.app_label for model_state in self.models.values())
self.apps = Apps([AppConfigStub(label) for label in sorted(app_labels)])
self.apps = Apps([AppConfigStub(label) for label in sorted(self.real_apps + list(app_labels))])
# We keep trying to render the models in a loop, ignoring invalid
# base errors, until the size of the unrendered models doesn't
# decrease by at least one, meaning there's a base dependency loop/
# missing base.
unrendered_models = list(self.models.values())
unrendered_models = list(self.models.values()) + real_models
while unrendered_models:
new_unrendered_models = []
for model in unrendered_models:
@ -53,14 +65,22 @@ class ProjectState(object):
unrendered_models = new_unrendered_models
# make sure apps has no dangling references
if self.apps._pending_lookups:
# There's some lookups left. See if we can first resolve them
# ourselves - sometimes fields are added after class_prepared is sent
for lookup_model, operations in self.apps._pending_lookups.items():
try:
model = self.apps.get_model(lookup_model[0], lookup_model[1])
except LookupError:
# Raise an error with a best-effort helpful message
# (only for the first issue). Error message should look like:
# "ValueError: Lookup failed for model referenced by
# field migrations.Book.author: migrations.Author"
dangling_lookup = list(self.apps._pending_lookups.items())[0]
raise ValueError("Lookup failed for model referenced by field {field}: {model[0]}.{model[1]}".format(
field=dangling_lookup[1][0][1],
model=dangling_lookup[0]))
field=operations[0][1],
model=lookup_model
))
else:
do_pending_lookups(model)
return self.apps
@classmethod
@ -75,6 +95,8 @@ class ProjectState(object):
def __eq__(self, other):
if set(self.models.keys()) != set(other.models.keys()):
return False
if set(self.real_apps) != set(other.real_apps):
return False
return all(model == other.models[key] for key, model in self.models.items())
def __ne__(self, other):

8
tests/migrations/test_loader.py
View File

@ -61,7 +61,7 @@ class LoaderTests(TestCase):
],
)
# Now render it out!
project_state = migration_loader.graph.project_state(("migrations", "0002_second"))
project_state = migration_loader.project_state(("migrations", "0002_second"))
self.assertEqual(len(project_state.models), 2)
author_state = project_state.models["migrations", "author"]
@ -76,6 +76,9 @@ class LoaderTests(TestCase):
["id", "author"]
)
# Ensure we've included unmigrated apps in there too
self.assertIn("contenttypes", project_state.real_apps)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_unmigdep"})
def test_load_unmigrated_dependency(self):
"""
@ -86,12 +89,11 @@ class LoaderTests(TestCase):
self.assertEqual(
migration_loader.graph.forwards_plan(("migrations", "0001_initial")),
[
("auth", "__first__"),
("migrations", "0001_initial"),
],
)
# Now render it out!
project_state = migration_loader.graph.project_state(("migrations", "0001_initial"))
project_state = migration_loader.project_state(("migrations", "0001_initial"))
self.assertEqual(len([m for a, m in project_state.models if a == "migrations"]), 1)
book_state = project_state.models["migrations", "book"]

25
tests/migrations/test_state.py
View File

@ -338,6 +338,31 @@ class StateTests(TestCase):
with self.assertRaises(ValueError):
rendered_state = project_state.render()
def test_real_apps(self):
"""
Tests that including real apps can resolve dangling FK errors.
This test relies on the fact that contenttypes is always loaded.
"""
new_apps = Apps()
class TestModel(models.Model):
ct = models.ForeignKey("contenttypes.ContentType")
class Meta:
app_label = "migrations"
apps = new_apps
# If we just stick it into an empty state it should fail
project_state = ProjectState()
project_state.add_model_state(ModelState.from_model(TestModel))
with self.assertRaises(ValueError):
rendered_state = project_state.render()
# If we include the real app it should succeed
project_state = ProjectState(real_apps=["contenttypes"])
project_state.add_model_state(ModelState.from_model(TestModel))
rendered_state = project_state.render()
self.assertEqual(len(rendered_state.get_models()), 2)
class ModelStateTests(TestCase):
def test_custom_model_base(self):