Subclassing Django's runserver causes command to be run twice
This week I was creating my own version of the Django management command
runserver. Like the built-in, I wanted to run a lightweight development only web server for my Django app. In addition, I was looking to run a syncdb, load some initial data and start up the server with that. The goal was to use an in-memory sqlite3 database, and use this command as a way to spin up an interactive test instance.
This is easily achieved by using
call_command to call
runserver in sequence. The in-memory sqlite3 config I would leave to a Django settings file. But I noticed that
syncdb seemed to be getting called twice, leading to double the start up time.
Rooting around in the Django bug database, I found that this was a known issue with the default auto-reloading functionality of
runserver. The solution turned out to be a simple as disabling that functionality by passing an option to the native
runserver when you use
import os from django.core.management import call_command from django.core.management.base import BaseCommand from django.core.management.commands.runserver import BaseRunserverCommand class Command(BaseCommand): ''' Runs the built-in Django runserver with initial schema and fixtures Note: cannot use auto-reloading because that casues resetdb to be called twice. ''' # remove this option from the --help for this command option_list = (o for o in BaseRunserverCommand.option_list if o.dest != 'use_reloader') help = 'Starts a lightweight web server testing.' args = '[optional port number, or ipaddr:port] appname appname' def handle(self, addrport='', *args, **options): call_command('syncdb', *args, **options) # BUG: runserver gets called twice if --noreload is False # https://code.djangoproject.com/ticket/8085 options['use_reloader'] = False call_command('runserver', addrport, *args, **options)