def cancel_game(self, request):
"""Delete the specified game."""
game = get_by_urlsafe(request.urlsafe_game_key, Game)
if game.game_over:
return game.to_form('Game completed. Cannot delete.')
# delete any levels
level_keys = Level.query(Level.game == game.key).fetch(keys_only=True)
ndb.delete_multi(level_keys)
game.key.delete()
return StringMessage(message='Game deleted.')
