91 lines
4.0 KiB
Python
91 lines
4.0 KiB
Python
from __future__ import unicode_literals
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import sys
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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, router, transaction
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from django.utils import six
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from django.utils.six.moves import input
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class Command(BaseCommand):
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help = ('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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def add_arguments(self, parser):
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parser.add_argument('--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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parser.add_argument('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS,
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help='Nominates a database to flush. Defaults to the "default" database.')
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def handle(self, **options):
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database = options.get('database')
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connection = connections[database]
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verbosity = 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_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 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 sqlflush'. "
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"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, database)
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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_config in apps.get_app_configs():
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all_models.extend(router.get_migratable_models(app_config, database, include_auto_created=True))
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emit_post_migrate_signal(verbosity, interactive, database)
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