308 lines
14 KiB
Python
308 lines
14 KiB
Python
import time
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from collections import OrderedDict
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from importlib import import_module
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from django.apps import apps
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from django.core.checks import Tags, run_checks
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from django.core.management.base import BaseCommand, CommandError
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from django.core.management.sql import (
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emit_post_migrate_signal, emit_pre_migrate_signal,
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)
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from django.db import DEFAULT_DB_ALIAS, connections, router
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from django.db.migrations.autodetector import MigrationAutodetector
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from django.db.migrations.executor import MigrationExecutor
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from django.db.migrations.loader import AmbiguityError
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from django.db.migrations.state import ModelState, ProjectState
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from django.utils.module_loading import module_has_submodule
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class Command(BaseCommand):
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help = "Updates database schema. Manages both apps with migrations and those without."
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def add_arguments(self, parser):
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parser.add_argument(
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'app_label', nargs='?',
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help='App label of an application to synchronize the state.',
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)
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parser.add_argument(
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'migration_name', nargs='?',
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help='Database state will be brought to the state after that '
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'migration. Use the name "zero" to unapply all migrations.',
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)
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parser.add_argument(
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'--noinput', '--no-input', action='store_false', dest='interactive',
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help='Tells Django to NOT prompt the user for input of any kind.',
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)
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parser.add_argument(
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'--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS,
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help='Nominates a database to synchronize. Defaults to the "default" database.',
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)
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parser.add_argument(
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'--fake', action='store_true', dest='fake',
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help='Mark migrations as run without actually running them.',
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)
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parser.add_argument(
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'--fake-initial', action='store_true', dest='fake_initial',
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help='Detect if tables already exist and fake-apply initial migrations if so. Make sure '
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'that the current database schema matches your initial migration before using this '
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'flag. Django will only check for an existing table name.',
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)
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parser.add_argument(
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'--run-syncdb', action='store_true', dest='run_syncdb',
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help='Creates tables for apps without migrations.',
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)
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def _run_checks(self, **kwargs):
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issues = run_checks(tags=[Tags.database])
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issues.extend(super()._run_checks(**kwargs))
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return issues
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def handle(self, *args, **options):
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self.verbosity = options['verbosity']
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self.interactive = options['interactive']
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# Import the 'management' module within each installed app, to register
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# dispatcher events.
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for app_config in apps.get_app_configs():
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if module_has_submodule(app_config.module, "management"):
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import_module('.management', app_config.name)
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# Get the database we're operating from
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db = options['database']
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connection = connections[db]
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# Hook for backends needing any database preparation
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connection.prepare_database()
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# Work out which apps have migrations and which do not
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executor = MigrationExecutor(connection, self.migration_progress_callback)
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# Raise an error if any migrations are applied before their dependencies.
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executor.loader.check_consistent_history(connection)
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# Before anything else, see if there's conflicting apps and drop out
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# hard if there are any
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conflicts = executor.loader.detect_conflicts()
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if conflicts:
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name_str = "; ".join(
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"%s in %s" % (", ".join(names), app)
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for app, names in conflicts.items()
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)
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raise CommandError(
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"Conflicting migrations detected; multiple leaf nodes in the "
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"migration graph: (%s).\nTo fix them run "
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"'python manage.py makemigrations --merge'" % name_str
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)
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# If they supplied command line arguments, work out what they mean.
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target_app_labels_only = True
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if options['app_label'] and options['migration_name']:
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app_label, migration_name = options['app_label'], options['migration_name']
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if app_label not in executor.loader.migrated_apps:
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raise CommandError(
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"App '%s' does not have migrations." % app_label
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)
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if migration_name == "zero":
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targets = [(app_label, None)]
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else:
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try:
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migration = executor.loader.get_migration_by_prefix(app_label, migration_name)
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except AmbiguityError:
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raise CommandError(
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"More than one migration matches '%s' in app '%s'. "
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"Please be more specific." %
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(migration_name, app_label)
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)
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except KeyError:
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raise CommandError("Cannot find a migration matching '%s' from app '%s'." % (
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migration_name, app_label))
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targets = [(app_label, migration.name)]
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target_app_labels_only = False
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elif options['app_label']:
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app_label = options['app_label']
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if app_label not in executor.loader.migrated_apps:
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raise CommandError(
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"App '%s' does not have migrations." % app_label
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)
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targets = [key for key in executor.loader.graph.leaf_nodes() if key[0] == app_label]
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else:
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targets = executor.loader.graph.leaf_nodes()
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plan = executor.migration_plan(targets)
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run_syncdb = options['run_syncdb'] and executor.loader.unmigrated_apps
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# Print some useful info
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_HEADING("Operations to perform:"))
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if run_syncdb:
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self.stdout.write(
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self.style.MIGRATE_LABEL(" Synchronize unmigrated apps: ") +
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(", ".join(sorted(executor.loader.unmigrated_apps)))
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)
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if target_app_labels_only:
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self.stdout.write(
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self.style.MIGRATE_LABEL(" Apply all migrations: ") +
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(", ".join(sorted({a for a, n in targets})) or "(none)")
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)
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else:
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if targets[0][1] is None:
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self.stdout.write(self.style.MIGRATE_LABEL(
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" Unapply all migrations: ") + "%s" % (targets[0][0], )
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)
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else:
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self.stdout.write(self.style.MIGRATE_LABEL(
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" Target specific migration: ") + "%s, from %s"
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% (targets[0][1], targets[0][0])
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)
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pre_migrate_state = executor._create_project_state(with_applied_migrations=True)
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pre_migrate_apps = pre_migrate_state.apps
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emit_pre_migrate_signal(
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self.verbosity, self.interactive, connection.alias, apps=pre_migrate_apps, plan=plan,
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)
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# Run the syncdb phase.
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if run_syncdb:
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_HEADING("Synchronizing apps without migrations:"))
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self.sync_apps(connection, executor.loader.unmigrated_apps)
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# Migrate!
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_HEADING("Running migrations:"))
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if not plan:
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if self.verbosity >= 1:
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self.stdout.write(" No migrations to apply.")
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# If there's changes that aren't in migrations yet, tell them how to fix it.
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autodetector = MigrationAutodetector(
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executor.loader.project_state(),
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ProjectState.from_apps(apps),
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)
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changes = autodetector.changes(graph=executor.loader.graph)
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if changes:
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self.stdout.write(self.style.NOTICE(
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" Your models have changes that are not yet reflected "
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"in a migration, and so won't be applied."
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))
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self.stdout.write(self.style.NOTICE(
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" Run 'manage.py makemigrations' to make new "
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"migrations, and then re-run 'manage.py migrate' to "
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"apply them."
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))
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fake = False
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fake_initial = False
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else:
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fake = options['fake']
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fake_initial = options['fake_initial']
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post_migrate_state = executor.migrate(
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targets, plan=plan, state=pre_migrate_state.clone(), fake=fake,
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fake_initial=fake_initial,
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)
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# post_migrate signals have access to all models. Ensure that all models
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# are reloaded in case any are delayed.
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post_migrate_state.clear_delayed_apps_cache()
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post_migrate_apps = post_migrate_state.apps
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# Re-render models of real apps to include relationships now that
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# we've got a final state. This wouldn't be necessary if real apps
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# models were rendered with relationships in the first place.
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with post_migrate_apps.bulk_update():
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model_keys = []
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for model_state in post_migrate_apps.real_models:
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model_key = model_state.app_label, model_state.name_lower
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model_keys.append(model_key)
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post_migrate_apps.unregister_model(*model_key)
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post_migrate_apps.render_multiple([
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ModelState.from_model(apps.get_model(*model)) for model in model_keys
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])
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# Send the post_migrate signal, so individual apps can do whatever they need
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# to do at this point.
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emit_post_migrate_signal(
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self.verbosity, self.interactive, connection.alias, apps=post_migrate_apps, plan=plan,
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)
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def migration_progress_callback(self, action, migration=None, fake=False):
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if self.verbosity >= 1:
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compute_time = self.verbosity > 1
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if action == "apply_start":
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if compute_time:
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self.start = time.time()
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self.stdout.write(" Applying %s..." % migration, ending="")
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self.stdout.flush()
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elif action == "apply_success":
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elapsed = " (%.3fs)" % (time.time() - self.start) if compute_time else ""
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if fake:
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self.stdout.write(self.style.SUCCESS(" FAKED" + elapsed))
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else:
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self.stdout.write(self.style.SUCCESS(" OK" + elapsed))
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elif action == "unapply_start":
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if compute_time:
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self.start = time.time()
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self.stdout.write(" Unapplying %s..." % migration, ending="")
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self.stdout.flush()
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elif action == "unapply_success":
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elapsed = " (%.3fs)" % (time.time() - self.start) if compute_time else ""
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if fake:
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self.stdout.write(self.style.SUCCESS(" FAKED" + elapsed))
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else:
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self.stdout.write(self.style.SUCCESS(" OK" + elapsed))
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elif action == "render_start":
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if compute_time:
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self.start = time.time()
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self.stdout.write(" Rendering model states...", ending="")
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self.stdout.flush()
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elif action == "render_success":
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elapsed = " (%.3fs)" % (time.time() - self.start) if compute_time else ""
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self.stdout.write(self.style.SUCCESS(" DONE" + elapsed))
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def sync_apps(self, connection, app_labels):
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"""Run the old syncdb-style operation on a list of app_labels."""
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with connection.cursor() as cursor:
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tables = connection.introspection.table_names(cursor)
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# Build the manifest of apps and models that are to be synchronized.
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all_models = [
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(
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app_config.label,
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router.get_migratable_models(app_config, connection.alias, include_auto_created=False),
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)
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for app_config in apps.get_app_configs()
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if app_config.models_module is not None and app_config.label in app_labels
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]
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def model_installed(model):
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opts = model._meta
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converter = connection.introspection.table_name_converter
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return not (
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(converter(opts.db_table) in tables) or
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(opts.auto_created and converter(opts.auto_created._meta.db_table) in tables)
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)
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manifest = OrderedDict(
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(app_name, list(filter(model_installed, model_list)))
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for app_name, model_list in all_models
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)
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# Create the tables for each model
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if self.verbosity >= 1:
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self.stdout.write(" Creating tables...\n")
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with connection.schema_editor() as editor:
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for app_name, model_list in manifest.items():
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for model in model_list:
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# Never install unmanaged models, etc.
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if not model._meta.can_migrate(connection):
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continue
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if self.verbosity >= 3:
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self.stdout.write(
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" Processing %s.%s model\n" % (app_name, model._meta.object_name)
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)
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if self.verbosity >= 1:
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self.stdout.write(" Creating table %s\n" % model._meta.db_table)
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editor.create_model(model)
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# Deferred SQL is executed when exiting the editor's context.
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if self.verbosity >= 1:
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self.stdout.write(" Running deferred SQL...\n")
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