django1/django/core/management/commands/flush.py

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import sys
from importlib import import_module
from optparse import make_option
from django.conf import settings
from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
from django.core.management import call_command
from django.core.management.base import NoArgsCommand, CommandError
from django.core.management.color import no_style
from django.core.management.sql import sql_flush, emit_post_migrate_signal
from django.utils.six.moves import input
from django.utils import six
class Command(NoArgsCommand):
option_list = NoArgsCommand.option_list + (
make_option('--noinput', action='store_false', dest='interactive', default=True,
help='Tells Django to NOT prompt the user for input of any kind.'),
make_option('--database', action='store', dest='database',
default=DEFAULT_DB_ALIAS, help='Nominates a database to flush. '
'Defaults to the "default" database.'),
make_option('--no-initial-data', action='store_false', dest='load_initial_data', default=True,
help='Tells Django not to load any initial data after database synchronization.'),
)
help = ('Returns the database to the state it was in immediately after '
'migrate was first executed. This means that all data will be removed '
'from the database, any post-migration handlers will be '
're-executed, and the initial_data fixture will be re-installed.')
def handle_noargs(self, **options):
db = options.get('database')
connection = connections[db]
verbosity = int(options.get('verbosity'))
interactive = options.get('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_name in settings.INSTALLED_APPS:
try:
import_module('.management', app_name)
except ImportError:
pass
sql_list = sql_flush(self.style, connection, only_django=True,
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 %r database,
and return each table to a fresh 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:
with transaction.commit_on_success_unless_managed():
cursor = connection.cursor()
for sql in sql_list:
cursor.execute(sql)
except Exception as e:
new_msg = (
"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.py sqlflush'. That's the SQL this command wasn't able to run.\n"
"The full error: %s") % (connection.settings_dict['NAME'], e)
six.reraise(CommandError, CommandError(new_msg), sys.exc_info()[2])
if not inhibit_post_migrate:
self.emit_post_migrate(verbosity, interactive, db)
# Reinstall the initial_data fixture.
if options.get('load_initial_data'):
# Reinstall the initial_data fixture.
call_command('loaddata', 'initial_data', **options)
else:
self.stdout.write("Flush cancelled.\n")
@staticmethod
def emit_post_migrate(verbosity, interactive, database):
# Emit the post migrate signal. This allows individual applications to
# respond as if the database had been migrated from scratch.
all_models = []
for app in models.get_apps():
all_models.extend(router.get_migratable_models(app, database, include_auto_created=True))
emit_post_migrate_signal(set(all_models), verbosity, interactive, database)