Add the third-party PolyModel class. This class supports inheritance in
Google App Engine Datastore Model classes.
from django.core.management.base import NoArgsCommand
class Command(NoArgsCommand):
help = "Runs the command-line client for the current DATABASE_ENGINE."
requires_model_validation = False
def handle_noargs(self, **options):
from django.db import runshell
runshell()