condition.py 文件源码

def __query__(self):
        q = super(NullSelectableSelectFilter, self).__query__()
        arg_name = 'select.{}'.format(self.attribute_name)
        s = self.request_args.get(arg_name, self.default)
        if s == self.NULL:
            q = self.attribute.is_(null())
        elif s == self.NOT_NULL:
            q = self.attribute.isnot(null())
        return q