def __all_equivs(self):
    equivs = {}
    for ent in self._mapper_entities:
        equivs.update(ent.mapper._equivalent_columns)
    return equivs
def __all_equivs(self):
    equivs = {}
    for ent in self._mapper_entities:
        equivs.update(ent.mapper._equivalent_columns)
    return equivs