def get_field_identifier(self):
        return self.field.get_identifier()
This method gets called when the next step/form should be rendered.
dataset/ETHPy150Open ambitioninc/django-query-builder/querybuilder/fields.py/AggregateField.get_field_identifier--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/formtools/wizard/views.py/WizardView.render_next_step