def db_type(self, connection):
        return None
changeInterpolator(action: QAction) -> None        
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/db/models/fields/related.py/RelatedField.db_type--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/modules/paramexplore.py/QParameterEditor.changeInterpolator