86 lines
3.7 KiB
Python
86 lines
3.7 KiB
Python
from importlib import import_module
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from django.apps import apps
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from django.core.management.base import BaseCommand, CommandError
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from django.core.management.color import no_style
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from django.core.management.sql import emit_post_migrate_signal, sql_flush
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from django.db import DEFAULT_DB_ALIAS, connections, transaction
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class Command(BaseCommand):
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help = (
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'Removes ALL DATA from the database, including data added during '
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'migrations. Does not achieve a "fresh install" state.'
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)
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def add_arguments(self, parser):
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parser.add_argument(
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'--noinput', '--no-input', action='store_false', dest='interactive',
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help='Tells Django to NOT prompt the user for input of any kind.',
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)
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parser.add_argument(
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'--database', action='store', dest='database', default=DEFAULT_DB_ALIAS,
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help='Nominates a database to flush. Defaults to the "default" database.',
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)
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def handle(self, **options):
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database = options['database']
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connection = connections[database]
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verbosity = options['verbosity']
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interactive = options['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_config in apps.get_app_configs():
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try:
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import_module('.management', app_config.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 an empty 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.atomic(using=database,
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savepoint=connection.features.can_rollback_ddl):
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with connection.cursor() as cursor:
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for sql in sql_list:
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cursor.execute(sql)
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except Exception as exc:
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raise CommandError(
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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 sqlflush'. "
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"That's the SQL this command wasn't able to run.\n" % (
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connection.settings_dict['NAME'],
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)
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) from exc
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# Empty sql_list may signify an empty database and post_migrate would then crash
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if sql_list and not inhibit_post_migrate:
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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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emit_post_migrate_signal(verbosity, interactive, database)
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else:
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self.stdout.write("Flush cancelled.\n")
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