from importlib import import_module from django.apps import apps from django.core.management.base import BaseCommand, CommandError from django.core.management.color import no_style from django.core.management.sql import emit_post_migrate_signal, sql_flush from django.db import DEFAULT_DB_ALIAS, connections 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): parser.add_argument( "--noinput", "--no-input", action="store_false", dest="interactive", help="Tells Django to NOT prompt the user for input of any kind.", ) parser.add_argument( "--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) self.style = no_style() # Import the 'management' module within each installed app, to register # dispatcher events. for app_config in apps.get_app_configs(): try: import_module(".management", app_config.name) except ImportError: pass sql_list = sql_flush( self.style, connection, reset_sequences=reset_sequences, allow_cascade=allow_cascade, ) if interactive: confirm = input( """You have requested a flush of the database. This will IRREVERSIBLY DESTROY all data currently in the "%s" 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"] ) else: confirm = "yes" if confirm == "yes": try: connection.ops.execute_sql_flush(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." % (connection.settings_dict["NAME"],) ) 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) else: self.stdout.write("Flush cancelled.")