'Passed a list of app IDs, will remove all existing members on the
collection and create new ones for each of the passed apps, in order.'

def set_apps(self, new_apps):

    self.remove_apps()
    for app_id in new_apps:
        self.add_app(Webapp.objects.get(pk=app_id))
    index_webapps.delay(new_apps)
