def __check_okay_to_chain(self):
        if self.__retrieved or self.__id is not None:
            raise InvalidOperation("cannot set options after executing query")
Renders the template for the given step, returning an HttpResponse object.
dataset/ETHPy150Open blynch/CloudMemeBackend/pymongo/cursor.py/Cursor.__check_okay_to_chain--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/formtools/wizard/legacy.py/FormWizard.render_template