def _setup_query(self):
        self.values = []
        self.related_ids = None
        if not hasattr(self, 'related_updates'):
            self.related_updates = {}
Runs on initialization and after cloning. Any attributes that would
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/db/models/sql/subqueries.py/UpdateQuery._setup_query