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from importlib import import_module
from django.apps import apps
from import BaseCommand, CommandError
from import no_style
from import emit_post_migrate_signal, sql_flush
from django.db import DEFAULT_DB_ALIAS, connections, transaction
class Command(BaseCommand):
help = (
'Removes ALL DATA from the database, including data added during '
'migrations. Does not achieve a "fresh install" state.'
stealth_options = ('reset_sequences', 'allow_cascade', 'inhibit_post_migrate')
def add_arguments(self, parser):
'--noinput', '--no-input', action='store_false', dest='interactive',
help='Tells Django to NOT prompt the user for input of any kind.',
'--database', action='store', dest='database', default=DEFAULT_DB_ALIAS,
help='Nominates a database to flush. Defaults to the "default" database.',
def handle(self, **options):
database = options['database']
connection = connections[database]
verbosity = options['verbosity']
interactive = options['interactive']
# The following are stealth options used by Django's internals.
reset_sequences = options.get('reset_sequences', True)
allow_cascade = options.get('allow_cascade', False)
inhibit_post_migrate = options.get('inhibit_post_migrate', False) = no_style()
# Import the 'management' module within each installed app, to register
# dispatcher events.
for app_config in apps.get_app_configs():
except ImportError:
sql_list = sql_flush(, connection, only_django=True,
if interactive:
confirm = input("""You have requested a flush of the database.
This will IRREVERSIBLY DESTROY all data currently in the %r database,
and return each table to an empty state.
Are you sure you want to do this?
Type 'yes' to continue, or 'no' to cancel: """ % connection.settings_dict['NAME'])
confirm = 'yes'
if confirm == 'yes':
with transaction.atomic(using=database,
with connection.cursor() as cursor:
for sql in sql_list:
except Exception as exc:
raise CommandError(
"Database %s couldn't be flushed. Possible reasons:\n"
" * The database isn't running or isn't configured correctly.\n"
" * At least one of the expected database tables doesn't exist.\n"
" * The SQL was invalid.\n"
"Hint: Look at the output of 'django-admin sqlflush'. "
"That's the SQL this command wasn't able to run.\n" % (
) from exc
# Empty sql_list may signify an empty database and post_migrate would then crash
if sql_list and not inhibit_post_migrate:
# Emit the post migrate signal. This allows individual applications to
# respond as if the database had been migrated from scratch.
emit_post_migrate_signal(verbosity, interactive, database)
self.stdout.write("Flush cancelled.\n")