212 lines
11 KiB
Python
212 lines
11 KiB
Python
from optparse import make_option
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import itertools
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import traceback
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from django.conf import settings
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from django.core.management import call_command
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from django.core.management.base import NoArgsCommand
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from django.core.management.color import color_style, no_style
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from django.core.management.sql import custom_sql_for_model, emit_post_sync_signal, emit_pre_sync_signal
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from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
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from django.db.migrations.executor import MigrationExecutor
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from django.utils.datastructures import SortedDict
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from django.utils.importlib import import_module
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class Command(NoArgsCommand):
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option_list = NoArgsCommand.option_list + (
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make_option('--noinput', action='store_false', dest='interactive', default=True,
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help='Tells Django to NOT prompt the user for input of any kind.'),
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make_option('--no-initial-data', action='store_false', dest='load_initial_data', default=True,
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help='Tells Django not to load any initial data after database synchronization.'),
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make_option('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS, help='Nominates a database to synchronize. '
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'Defaults to the "default" database.'),
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)
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help = "Updates database schema. Manages both apps with migrations and those without."
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def handle_noargs(self, **options):
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self.verbosity = int(options.get('verbosity'))
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self.interactive = options.get('interactive')
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self.show_traceback = options.get('traceback')
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self.load_initial_data = options.get('load_initial_data')
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self.test_database = options.get('test_database', False)
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self.style = color_style()
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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_name in settings.INSTALLED_APPS:
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try:
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import_module('.management', app_name)
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except ImportError as exc:
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# This is slightly hackish. We want to ignore ImportErrors
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# if the "management" module itself is missing -- but we don't
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# want to ignore the exception if the management module exists
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# but raises an ImportError for some reason. The only way we
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# can do this is to check the text of the exception. Note that
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# we're a bit broad in how we check the text, because different
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# Python implementations may not use the same text.
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# CPython uses the text "No module named management"
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# PyPy uses "No module named myproject.myapp.management"
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msg = exc.args[0]
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if not msg.startswith('No module named') or 'management' not in msg:
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raise
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# Get the database we're operating from
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db = options.get('database')
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connection = connections[db]
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# Work out which apps have migrations and which do not
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_HEADING("Calculating migration plan:"))
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executor = MigrationExecutor(connection, self.migration_progress_callback)
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_LABEL(" Apps without migrations: ") + (", ".join(executor.loader.unmigrated_apps) or "(none)"))
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# Work out what targets they want, and then make a migration plan
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# TODO: Let users select targets
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targets = executor.loader.graph.leaf_nodes()
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plan = executor.migration_plan(targets)
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if self.verbosity >= 1:
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self.stdout.write(self.style.MIGRATE_LABEL(" Apps with migrations: ") + (", ".join(executor.loader.migrated_apps) or "(none)"))
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# Run the syncdb phase.
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# If you ever manage to get rid of this, I owe you many, many drinks.
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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 needed.")
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else:
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executor.migrate(targets, plan)
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def migration_progress_callback(self, action, migration):
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if self.verbosity >= 1:
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if action == "apply_start":
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self.stdout.write(" Applying %s... " % migration)
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self.stdout.flush()
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elif action == "apply_success":
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self.stdout.write(" OK\n")
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elif action == "unapply_start":
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self.stdout.write(" Unapplying %s... " % migration)
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self.stdout.flush()
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elif action == "unapply_success":
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self.stdout.write(" OK\n")
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def sync_apps(self, connection, apps):
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"Runs the old syncdb-style operation on a list of apps."
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cursor = connection.cursor()
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# Get a list of already installed *models* so that references work right.
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tables = connection.introspection.table_names()
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seen_models = connection.introspection.installed_models(tables)
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created_models = set()
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pending_references = {}
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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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(app.__name__.split('.')[-2],
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[
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m for m in models.get_models(app, include_auto_created=True)
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if router.allow_syncdb(connection.alias, m)
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])
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for app in models.get_apps() if app.__name__.split('.')[-2] in apps
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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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# Note that if a model is unmanaged we short-circuit and never try to install it
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return not ((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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manifest = SortedDict(
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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_models = set([x for x in itertools.chain(*manifest.values())])
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emit_pre_sync_signal(create_models, self.verbosity, self.interactive, connection.alias)
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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 transaction.commit_on_success_unless_managed(using=connection.alias):
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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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# Create the model's database table, if it doesn't already exist.
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if self.verbosity >= 3:
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self.stdout.write(" Processing %s.%s model\n" % (app_name, model._meta.object_name))
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sql, references = connection.creation.sql_create_model(model, no_style(), seen_models)
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seen_models.add(model)
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created_models.add(model)
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for refto, refs in references.items():
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pending_references.setdefault(refto, []).extend(refs)
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if refto in seen_models:
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sql.extend(connection.creation.sql_for_pending_references(refto, no_style(), pending_references))
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sql.extend(connection.creation.sql_for_pending_references(model, no_style(), pending_references))
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if self.verbosity >= 1 and sql:
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self.stdout.write(" Creating table %s\n" % model._meta.db_table)
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for statement in sql:
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cursor.execute(statement)
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tables.append(connection.introspection.table_name_converter(model._meta.db_table))
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# Send the post_syncdb signal, so individual apps can do whatever they need
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# to do at this point.
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emit_post_sync_signal(created_models, self.verbosity, self.interactive, connection.alias)
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# The connection may have been closed by a syncdb handler.
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cursor = connection.cursor()
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# Install custom SQL for the app (but only if this
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# is a model we've just created)
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if self.verbosity >= 1:
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self.stdout.write(" Installing custom SQL...\n")
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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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if model in created_models:
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custom_sql = custom_sql_for_model(model, no_style(), connection)
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if custom_sql:
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if self.verbosity >= 2:
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self.stdout.write(" Installing custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
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try:
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with transaction.commit_on_success_unless_managed(using=connection.alias):
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for sql in custom_sql:
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cursor.execute(sql)
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except Exception as e:
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self.stderr.write(" Failed to install custom SQL for %s.%s model: %s\n" % (app_name, model._meta.object_name, e))
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if self.show_traceback:
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traceback.print_exc()
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else:
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if self.verbosity >= 3:
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self.stdout.write(" No custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
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if self.verbosity >= 1:
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self.stdout.write(" Installing indexes...\n")
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# Install SQL indices for all newly created models
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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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if model in created_models:
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index_sql = connection.creation.sql_indexes_for_model(model, no_style())
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if index_sql:
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if self.verbosity >= 2:
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self.stdout.write(" Installing index for %s.%s model\n" % (app_name, model._meta.object_name))
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try:
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with transaction.commit_on_success_unless_managed(using=connection.alias):
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for sql in index_sql:
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cursor.execute(sql)
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except Exception as e:
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self.stderr.write(" Failed to install index for %s.%s model: %s\n" % (app_name, model._meta.object_name, e))
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# Load initial_data fixtures (unless that has been disabled)
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if self.load_initial_data:
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call_command('loaddata', 'initial_data', verbosity=self.verbosity, database=connection.alias, skip_validation=True)
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