93 lines
3.5 KiB
Python
93 lines
3.5 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
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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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stealth_options = ("reset_sequences", "allow_cascade", "inhibit_post_migrate")
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def add_arguments(self, parser):
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parser.add_argument(
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"--noinput",
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"--no-input",
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action="store_false",
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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",
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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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)
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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(
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self.style,
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connection,
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reset_sequences=reset_sequences,
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allow_cascade=allow_cascade,
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)
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if interactive:
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confirm = input(
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"""You have requested a flush of the database.
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This will IRREVERSIBLY DESTROY all data currently in the "%s" 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: """
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% connection.settings_dict["NAME"]
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)
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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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connection.ops.execute_sql_flush(sql_list)
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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."
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% (connection.settings_dict["NAME"],)
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) from exc
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# Empty sql_list may signify an empty database and post_migrate
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# 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.")
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