django1/django/core/management/commands/migrate.py

310 lines
16 KiB
Python

# encoding: utf8
from __future__ import unicode_literals
from optparse import make_option
from collections import OrderedDict
from importlib import import_module
import itertools
import traceback
from django.conf import settings
from django.core.management import call_command
from django.core.management.base import BaseCommand, CommandError
from django.core.management.color import no_style
from django.core.management.sql import custom_sql_for_model, emit_post_migrate_signal, emit_pre_migrate_signal
from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
from django.db.migrations.executor import MigrationExecutor
from django.db.migrations.loader import MigrationLoader, AmbiguityError
from django.db.migrations.state import ProjectState
from django.db.migrations.autodetector import MigrationAutodetector
from django.db.models.loading import cache
from django.utils.module_loading import module_has_submodule
class Command(BaseCommand):
option_list = BaseCommand.option_list + (
make_option('--noinput', action='store_false', dest='interactive', default=True,
help='Tells Django to NOT prompt the user for input of any kind.'),
make_option('--no-initial-data', action='store_false', dest='load_initial_data', default=True,
help='Tells Django not to load any initial data after database synchronization.'),
make_option('--database', action='store', dest='database',
default=DEFAULT_DB_ALIAS, help='Nominates a database to synchronize. '
'Defaults to the "default" database.'),
make_option('--fake', action='store_true', dest='fake', default=False,
help='Mark migrations as run without actually running them'),
make_option('--list', '-l', action='store_true', dest='list', default=False,
help='Show a list of all known migrations and which are applied'),
)
help = "Updates database schema. Manages both apps with migrations and those without."
def handle(self, *args, **options):
self.verbosity = int(options.get('verbosity'))
self.interactive = options.get('interactive')
self.show_traceback = options.get('traceback')
self.load_initial_data = options.get('load_initial_data')
self.test_database = options.get('test_database', False)
# Import the 'management' module within each installed app, to register
# dispatcher events.
for app_name in settings.INSTALLED_APPS:
if module_has_submodule(import_module(app_name), "management"):
import_module('.management', app_name)
# Get the database we're operating from
db = options.get('database')
connection = connections[db]
# If they asked for a migration listing, quit main execution flow and show it
if options.get("list", False):
return self.show_migration_list(connection, args)
# Work out which apps have migrations and which do not
executor = MigrationExecutor(connection, self.migration_progress_callback)
# If they supplied command line arguments, work out what they mean.
run_syncdb = False
target_app_labels_only = True
if len(args) > 2:
raise CommandError("Too many command-line arguments (expecting 'appname' or 'appname migrationname')")
elif len(args) == 2:
app_label, migration_name = args
if app_label not in executor.loader.migrated_apps:
raise CommandError("App '%s' does not have migrations (you cannot selectively sync unmigrated apps)" % app_label)
if migration_name == "zero":
targets = [(app_label, None)]
else:
try:
migration = executor.loader.get_migration_by_prefix(app_label, migration_name)
except AmbiguityError:
raise CommandError("More than one migration matches '%s' in app '%s'. Please be more specific." % (app_label, migration_name))
except KeyError:
raise CommandError("Cannot find a migration matching '%s' from app '%s'." % (app_label, migration_name))
targets = [(app_label, migration.name)]
target_app_labels_only = False
elif len(args) == 1:
app_label = args[0]
if app_label not in executor.loader.migrated_apps:
raise CommandError("App '%s' does not have migrations (you cannot selectively sync unmigrated apps)" % app_label)
targets = [key for key in executor.loader.graph.leaf_nodes() if key[0] == app_label]
else:
targets = executor.loader.graph.leaf_nodes()
run_syncdb = True
plan = executor.migration_plan(targets)
# Print some useful info
if self.verbosity >= 1:
self.stdout.write(self.style.MIGRATE_HEADING("Operations to perform:"))
if run_syncdb:
self.stdout.write(self.style.MIGRATE_LABEL(" Synchronize unmigrated apps: ") + (", ".join(executor.loader.unmigrated_apps) or "(none)"))
if target_app_labels_only:
self.stdout.write(self.style.MIGRATE_LABEL(" Apply all migrations: ") + (", ".join(set(a for a, n in targets)) or "(none)"))
else:
if targets[0][1] is None:
self.stdout.write(self.style.MIGRATE_LABEL(" Unapply all migrations: ") + "%s" % (targets[0][0], ))
else:
self.stdout.write(self.style.MIGRATE_LABEL(" Target specific migration: ") + "%s, from %s" % (targets[0][1], targets[0][0]))
# Run the syncdb phase.
# If you ever manage to get rid of this, I owe you many, many drinks.
# Note that pre_migrate is called from inside here, as it needs
# the list of models about to be installed.
if run_syncdb:
if self.verbosity >= 1:
self.stdout.write(self.style.MIGRATE_HEADING("Synchronizing apps without migrations:"))
created_models = self.sync_apps(connection, executor.loader.unmigrated_apps)
else:
created_models = []
# Migrate!
if self.verbosity >= 1:
self.stdout.write(self.style.MIGRATE_HEADING("Running migrations:"))
if not plan:
if self.verbosity >= 1:
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(),
ProjectState.from_app_cache(cache),
)
changes = autodetector.changes(graph=executor.loader.graph)
if changes:
self.stdout.write(self.style.NOTICE(" Your models have changes that are not yet reflected in a migration, and so won't be applied."))
self.stdout.write(self.style.NOTICE(" Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them."))
else:
executor.migrate(targets, plan, fake=options.get("fake", False))
# Send the post_migrate signal, so individual apps can do whatever they need
# to do at this point.
emit_post_migrate_signal(created_models, self.verbosity, self.interactive, connection.alias)
def migration_progress_callback(self, action, migration, fake=False):
if self.verbosity >= 1:
if action == "apply_start":
self.stdout.write(" Applying %s..." % migration, ending="")
self.stdout.flush()
elif action == "apply_success":
if fake:
self.stdout.write(self.style.MIGRATE_SUCCESS(" FAKED"))
else:
self.stdout.write(self.style.MIGRATE_SUCCESS(" OK"))
elif action == "unapply_start":
self.stdout.write(" Unapplying %s..." % migration, ending="")
self.stdout.flush()
elif action == "unapply_success":
if fake:
self.stdout.write(self.style.MIGRATE_SUCCESS(" FAKED"))
else:
self.stdout.write(self.style.MIGRATE_SUCCESS(" OK"))
def sync_apps(self, connection, apps):
"Runs the old syncdb-style operation on a list of apps."
cursor = connection.cursor()
# Get a list of already installed *models* so that references work right.
tables = connection.introspection.table_names()
seen_models = connection.introspection.installed_models(tables)
created_models = set()
pending_references = {}
# Build the manifest of apps and models that are to be synchronized
all_models = [
(app.__name__.split('.')[-2],
router.get_migratable_models(app, connection.alias, include_auto_created=True))
for app in models.get_apps() if app.__name__.split('.')[-2] in apps
]
def model_installed(model):
opts = model._meta
converter = connection.introspection.table_name_converter
# Note that if a model is unmanaged we short-circuit and never try to install it
return not ((converter(opts.db_table) in tables) or
(opts.auto_created and converter(opts.auto_created._meta.db_table) in tables))
manifest = OrderedDict(
(app_name, list(filter(model_installed, model_list)))
for app_name, model_list in all_models
)
create_models = set(itertools.chain(*manifest.values()))
emit_pre_migrate_signal(create_models, self.verbosity, self.interactive, connection.alias)
# Create the tables for each model
if self.verbosity >= 1:
self.stdout.write(" Creating tables...\n")
with transaction.atomic(using=connection.alias, savepoint=False):
for app_name, model_list in manifest.items():
for model in model_list:
# Create the model's database table, if it doesn't already exist.
if self.verbosity >= 3:
self.stdout.write(" Processing %s.%s model\n" % (app_name, model._meta.object_name))
sql, references = connection.creation.sql_create_model(model, no_style(), seen_models)
seen_models.add(model)
created_models.add(model)
for refto, refs in references.items():
pending_references.setdefault(refto, []).extend(refs)
if refto in seen_models:
sql.extend(connection.creation.sql_for_pending_references(refto, no_style(), pending_references))
sql.extend(connection.creation.sql_for_pending_references(model, no_style(), pending_references))
if self.verbosity >= 1 and sql:
self.stdout.write(" Creating table %s\n" % model._meta.db_table)
for statement in sql:
cursor.execute(statement)
tables.append(connection.introspection.table_name_converter(model._meta.db_table))
# We force a commit here, as that was the previous behaviour.
# If you can prove we don't need this, remove it.
transaction.set_dirty(using=connection.alias)
# The connection may have been closed by a syncdb handler.
cursor = connection.cursor()
# Install custom SQL for the app (but only if this
# is a model we've just created)
if self.verbosity >= 1:
self.stdout.write(" Installing custom SQL...\n")
for app_name, model_list in manifest.items():
for model in model_list:
if model in created_models:
custom_sql = custom_sql_for_model(model, no_style(), connection)
if custom_sql:
if self.verbosity >= 2:
self.stdout.write(" Installing custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
try:
with transaction.commit_on_success_unless_managed(using=connection.alias):
for sql in custom_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write(" Failed to install custom SQL for %s.%s model: %s\n" % (app_name, model._meta.object_name, e))
if self.show_traceback:
traceback.print_exc()
else:
if self.verbosity >= 3:
self.stdout.write(" No custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
if self.verbosity >= 1:
self.stdout.write(" Installing indexes...\n")
# Install SQL indices for all newly created models
for app_name, model_list in manifest.items():
for model in model_list:
if model in created_models:
index_sql = connection.creation.sql_indexes_for_model(model, no_style())
if index_sql:
if self.verbosity >= 2:
self.stdout.write(" Installing index for %s.%s model\n" % (app_name, model._meta.object_name))
try:
with transaction.commit_on_success_unless_managed(using=connection.alias):
for sql in index_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write(" Failed to install index for %s.%s model: %s\n" % (app_name, model._meta.object_name, e))
# Load initial_data fixtures (unless that has been disabled)
if self.load_initial_data:
call_command('loaddata', 'initial_data', verbosity=self.verbosity, database=connection.alias, skip_validation=True)
return created_models
def show_migration_list(self, connection, apps=None):
"""
Shows a list of all migrations on the system, or only those of
some named apps.
"""
# Load migrations from disk/DB
loader = MigrationLoader(connection)
graph = loader.graph
# If we were passed a list of apps, validate it
if apps:
invalid_apps = []
for app in apps:
if app not in loader.migrated_apps:
invalid_apps.append(app)
if invalid_apps:
raise CommandError("No migrations present for: %s" % (", ".join(invalid_apps)))
# Otherwise, show all apps in alphabetic order
else:
apps = sorted(loader.migrated_apps)
# For each app, print its migrations in order from oldest (roots) to
# newest (leaves).
for app in apps:
self.stdout.write(app, self.style.MIGRATE_LABEL)
shown = set()
for node in graph.leaf_nodes(app):
for plan_node in graph.forwards_plan(node):
if plan_node not in shown and plan_node[0] == app:
# Give it a nice title if it's a squashed one
title = plan_node[1]
if graph.nodes[plan_node].replaces:
title += " (%s squashed migrations)" % len(graph.nodes[plan_node].replaces)
# Mark it as applied/unapplied
if plan_node in loader.applied_migrations:
self.stdout.write(" [X] %s" % title)
else:
self.stdout.write(" [ ] %s" % title)
shown.add(plan_node)
# If we didn't print anything, then a small message
if not shown:
self.stdout.write(" (no migrations)", self.style.MIGRATE_FAILURE)