102 lines
4.6 KiB
Python
102 lines
4.6 KiB
Python
import sys
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from importlib import import_module
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from optparse import make_option
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from django.conf import settings
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from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
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from django.core.management import call_command
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from django.core.management.base import NoArgsCommand, CommandError
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from django.core.management.color import no_style
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from django.core.management.sql import sql_flush, emit_post_migrate_signal
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from django.utils.six.moves import input
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from django.utils import six
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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('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS, help='Nominates a database to flush. '
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'Defaults to the "default" database.'),
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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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)
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help = ('Returns the database to the state it was in immediately after '
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'migrate was first executed. This means that all data will be removed '
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'from the database, any post-migration handlers will be '
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're-executed, and the initial_data fixture will be re-installed.')
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def handle_noargs(self, **options):
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db = options.get('database')
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connection = connections[db]
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verbosity = int(options.get('verbosity'))
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interactive = options.get('interactive')
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# The following are stealth options used by Django's internals.
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reset_sequences = options.get('reset_sequences', True)
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allow_cascade = options.get('allow_cascade', False)
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inhibit_post_migrate = options.get('inhibit_post_migrate', False)
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self.style = no_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:
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pass
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sql_list = sql_flush(self.style, connection, only_django=True,
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reset_sequences=reset_sequences,
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allow_cascade=allow_cascade)
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if interactive:
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confirm = input("""You have requested a flush of the database.
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This will IRREVERSIBLY DESTROY all data currently in the %r database,
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and return each table to a fresh state.
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Are you sure you want to do this?
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Type 'yes' to continue, or 'no' to cancel: """ % connection.settings_dict['NAME'])
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else:
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confirm = 'yes'
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if confirm == 'yes':
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try:
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with transaction.commit_on_success_unless_managed():
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cursor = connection.cursor()
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for sql in sql_list:
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cursor.execute(sql)
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except Exception as e:
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new_msg = (
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"Database %s couldn't be flushed. Possible reasons:\n"
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" * The database isn't running or isn't configured correctly.\n"
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" * At least one of the expected database tables doesn't exist.\n"
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" * The SQL was invalid.\n"
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"Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL this command wasn't able to run.\n"
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"The full error: %s") % (connection.settings_dict['NAME'], e)
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six.reraise(CommandError, CommandError(new_msg), sys.exc_info()[2])
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if not inhibit_post_migrate:
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self.emit_post_migrate(verbosity, interactive, db)
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# Reinstall the initial_data fixture.
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if options.get('load_initial_data'):
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# Reinstall the initial_data fixture.
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call_command('loaddata', 'initial_data', **options)
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else:
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self.stdout.write("Flush cancelled.\n")
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@staticmethod
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def emit_post_migrate(verbosity, interactive, database):
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# Emit the post migrate signal. This allows individual applications to
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# respond as if the database had been migrated from scratch.
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all_models = []
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for app in models.get_apps():
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all_models.extend([
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m for m in models.get_models(app, include_auto_created=True)
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if router.allow_migrate(database, m)
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])
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emit_post_migrate_signal(set(all_models), verbosity, interactive, database)
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