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Fixed #26117 -- Consulted database routers in initial migration detection. 

Thanks Simon Charette for help.
This commit is contained in:
Scott Sexton 2016-01-24 18:23:38 -06:00 committed by Tim Graham
parent 1f8cfcf3b4
commit fc584f0685
5 changed files with 93 additions and 45 deletions
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19
django/db/migrations/executor.py
View File

@ -1,7 +1,7 @@
from __future__ import unicode_literals
from django.apps.registry import apps as global_apps
from django.db import migrations
from django.db import migrations, router
from .exceptions import InvalidMigrationPlan
from .loader import MigrationLoader
@ -250,6 +250,19 @@ class MigrationExecutor(object):
tables or columns it would create exist. This is intended only for use
on initial migrations (as it only looks for CreateModel and AddField).
"""
def should_skip_detecting_model(migration, model):
"""
No need to detect tables for proxy models, unmanaged models, or
models that can't be migrated on the current database.
"""
return (
model._meta.proxy or not model._meta.managed or not
router.allow_migrate(
self.connection.alias, migration.app_label,
model_name=model._meta.model_name,
)
)
if migration.initial is None:
# Bail if the migration isn't the first one in its app
if any(app == migration.app_label for app, name in migration.dependencies):
@ -274,7 +287,7 @@ class MigrationExecutor(object):
# We have to fetch the model to test with from the
# main app cache, as it's not a direct dependency.
model = global_apps.get_model(model._meta.swapped)
if model._meta.proxy or not model._meta.managed:
if should_skip_detecting_model(migration, model):
continue
if model._meta.db_table not in existing_table_names:
return False, project_state
@ -285,7 +298,7 @@ class MigrationExecutor(object):
# We have to fetch the model to test with from the
# main app cache, as it's not a direct dependency.
model = global_apps.get_model(model._meta.swapped)
if model._meta.proxy or not model._meta.managed:
if should_skip_detecting_model(migration, model):
continue
table = model._meta.db_table

9
tests/migrations/routers.py Normal file
View File

@ -0,0 +1,9 @@
class TestRouter(object):
def allow_migrate(self, db, app_label, model_name=None, **hints):
"""
The Tribble model should be the only one to appear in the 'other' db.
"""
if model_name == 'tribble':
return db == 'other'
elif db == 'other':
return False

54
tests/migrations/test_base.py
View File

@ -5,7 +5,7 @@ from contextlib import contextmanager
from importlib import import_module
from django.apps import apps
from django.db import connection
from django.db import connections
from django.db.migrations.recorder import MigrationRecorder
from django.test import TransactionTestCase
from django.test.utils import extend_sys_path
@ -21,40 +21,44 @@ class MigrationTestBase(TransactionTestCase):
def tearDown(self):
# Reset applied-migrations state.
recorder = MigrationRecorder(connection)
for db in connections:
recorder = MigrationRecorder(connections[db])
recorder.migration_qs.filter(app='migrations').delete()
def get_table_description(self, table):
with connection.cursor() as cursor:
return connection.introspection.get_table_description(cursor, table)
def get_table_description(self, table, using='default'):
with connections[using].cursor() as cursor:
return connections[using].introspection.get_table_description(cursor, table)
def assertTableExists(self, table):
with connection.cursor() as cursor:
self.assertIn(table, connection.introspection.table_names(cursor))
def assertTableExists(self, table, using='default'):
with connections[using].cursor() as cursor:
self.assertIn(table, connections[using].introspection.table_names(cursor))
def assertTableNotExists(self, table):
with connection.cursor() as cursor:
self.assertNotIn(table, connection.introspection.table_names(cursor))
def assertTableNotExists(self, table, using='default'):
with connections[using].cursor() as cursor:
self.assertNotIn(table, connections[using].introspection.table_names(cursor))
def assertColumnExists(self, table, column):
self.assertIn(column, [c.name for c in self.get_table_description(table)])
def assertColumnExists(self, table, column, using='default'):
self.assertIn(column, [c.name for c in self.get_table_description(table, using=using)])
def assertColumnNotExists(self, table, column):
self.assertNotIn(column, [c.name for c in self.get_table_description(table)])
def assertColumnNotExists(self, table, column, using='default'):
self.assertNotIn(column, [c.name for c in self.get_table_description(table, using=using)])
def assertColumnNull(self, table, column):
self.assertEqual([c.null_ok for c in self.get_table_description(table) if c.name == column][0], True)
def _get_column_allows_null(self, table, column, using):
return [c.null_ok for c in self.get_table_description(table, using=using) if c.name == column][0]
def assertColumnNotNull(self, table, column):
self.assertEqual([c.null_ok for c in self.get_table_description(table) if c.name == column][0], False)
def assertColumnNull(self, table, column, using='default'):
self.assertEqual(self._get_column_allows_null(table, column, using), True)
def assertIndexExists(self, table, columns, value=True):
with connection.cursor() as cursor:
def assertColumnNotNull(self, table, column, using='default'):
self.assertEqual(self._get_column_allows_null(table, column, using), False)
def assertIndexExists(self, table, columns, value=True, using='default'):
with connections[using].cursor() as cursor:
self.assertEqual(
value,
any(
c["index"]
for c in connection.introspection.get_constraints(cursor, table).values()
for c in connections[using].introspection.get_constraints(cursor, table).values()
if c['columns'] == list(columns)
),
)
@ -62,13 +66,13 @@ 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:
def assertFKExists(self, table, columns, to, value=True, using='default'):
with connections[using].cursor() as cursor:
self.assertEqual(
value,
any(
c["foreign_key"] == to
for c in connection.introspection.get_constraints(cursor, table).values()
for c in connections[using].introspection.get_constraints(cursor, table).values()
if c['columns'] == list(columns)
),
)

45
tests/migrations/test_commands.py
View File

@ -7,7 +7,7 @@ import os
from django.apps import apps
from django.core.management import CommandError, call_command
from django.db import DatabaseError, connection, models
from django.db import DatabaseError, connection, connections, models
from django.db.migrations.recorder import MigrationRecorder
from django.test import ignore_warnings, mock, override_settings
from django.utils import six
@ -22,6 +22,7 @@ class MigrateTests(MigrationTestBase):
"""
Tests running the migrate command.
"""
multi_db = True
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
def test_migrate(self):
@ -75,25 +76,36 @@ class MigrateTests(MigrationTestBase):
self.assertTableNotExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
@override_settings(
MIGRATION_MODULES={"migrations": "migrations.test_migrations"},
DATABASE_ROUTERS=['migrations.routers.TestRouter'],
)
def test_migrate_fake_initial(self):
"""
#24184 - Tests that --fake-initial only works if all tables created in
the initial migration of an app exists
--fake-initial only works if all tables created in the initial
migration of an app exists. Database routers must be obeyed when doing
that check.
"""
# Make sure no tables are created
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
for db in connections:
self.assertTableNotExists("migrations_author", using=db)
self.assertTableNotExists("migrations_tribble", using=db)
# Run the migrations to 0001 only
call_command("migrate", "migrations", "0001", verbosity=0)
call_command("migrate", "migrations", "0001", verbosity=0, database="other")
# Make sure the right tables exist
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
self.assertTableNotExists("migrations_tribble")
# Also check the "other" database
self.assertTableNotExists("migrations_author", using="other")
self.assertTableExists("migrations_tribble", using="other")
# Fake a roll-back
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
call_command("migrate", "migrations", "zero", fake=True, verbosity=0, database="other")
# Make sure the tables still exist
self.assertTableExists("migrations_author")
self.assertTableExists("migrations_tribble")
self.assertTableExists("migrations_tribble", using="other")
# Try to run initial migration
with self.assertRaises(DatabaseError):
call_command("migrate", "migrations", "0001", verbosity=0)
@ -101,18 +113,24 @@ class MigrateTests(MigrationTestBase):
out = six.StringIO()
with mock.patch('django.core.management.color.supports_color', lambda *args: False):
call_command("migrate", "migrations", "0001", fake_initial=True, stdout=out, verbosity=1)
call_command("migrate", "migrations", "0001", fake_initial=True, verbosity=0, database="other")
self.assertIn(
"migrations.0001_initial... faked",
out.getvalue().lower()
)
# Run migrations all the way
call_command("migrate", verbosity=0)
call_command("migrate", verbosity=0, database="other")
# Make sure the right tables exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableExists("migrations_book")
self.assertTableNotExists("migrations_author", using="other")
self.assertTableNotExists("migrations_tribble", using="other")
self.assertTableNotExists("migrations_book", using="other")
# Fake a roll-back
call_command("migrate", "migrations", "zero", fake=True, verbosity=0)
call_command("migrate", "migrations", "zero", fake=True, verbosity=0, database="other")
# Make sure the tables still exist
self.assertTableExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
@ -127,12 +145,15 @@ class MigrateTests(MigrationTestBase):
call_command("migrate", "migrations", fake_initial=True, verbosity=0)
# Fake a apply
call_command("migrate", "migrations", fake=True, verbosity=0)
call_command("migrate", "migrations", fake=True, verbosity=0, database="other")
# Unmigrate everything
call_command("migrate", "migrations", "zero", verbosity=0)
call_command("migrate", "migrations", "zero", verbosity=0, database="other")
# Make sure it's all gone
self.assertTableNotExists("migrations_author")
self.assertTableNotExists("migrations_tribble")
self.assertTableNotExists("migrations_book")
for db in connections:
self.assertTableNotExists("migrations_author", using=db)
self.assertTableNotExists("migrations_tribble", using=db)
self.assertTableNotExists("migrations_book", using=db)
@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_fake_split_initial"})
def test_migrate_fake_split_initial(self):
@ -1066,7 +1087,7 @@ class SquashMigrationsTests(MigrationTestBase):
out = six.StringIO()
with self.temporary_migration_module(module="migrations.test_migrations"):
call_command("squashmigrations", "migrations", "0002", interactive=False, verbosity=1, stdout=out)
self.assertIn("Optimized from 7 operations to 3 operations.", force_text(out.getvalue()))
self.assertIn("Optimized from 8 operations to 3 operations.", force_text(out.getvalue()))
def test_ticket_23799_squashmigrations_no_optimize(self):
"""

9
tests/migrations/test_migrations/0001_initial.py
View File

@ -9,7 +9,6 @@ class Migration(migrations.Migration):
initial = True
operations = [
migrations.CreateModel(
"Author",
[
@ -20,7 +19,6 @@ class Migration(migrations.Migration):
("silly_field", models.BooleanField(default=False)),
],
),
migrations.CreateModel(
"Tribble",
[
@ -28,10 +26,13 @@ class Migration(migrations.Migration):
("fluffy", models.BooleanField(default=True)),
],
),
migrations.AddField(
model_name='tribble',
name='bool',
field=models.BooleanField(default=False),
),
migrations.AlterUniqueTogether(
name='author',
unique_together=set([('name', 'slug')]),
),
]