def _prepare(self):
        if ((self._fields and len(self._fields) > 1) or
                (not self._fields and len(self.model._meta.fields) > 1)):
            raise TypeError('Cannot use a multi-field %s as a filter value.'
                    % self.__class__.__name__)
        return self
Returns the actual command name. Uses the alias mapping.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/query.py/ValuesQuerySet._prepare--crossover with--dataset/ETHPy150Open softlayer/softlayer-python/SoftLayer/CLI/environment.py/Environment.resolve_alias