code: def column(self):
          
          field = self.name
  
          model_field = get_model_field(self.schema, field)
  
          try:
              return getattr(self.model, model_field)
          except AttributeError:
              raise InvalidFilters("{} has no attribute {}".format(self.model.__name__, model_field))
docs: Get the column object
  
          :param DeclarativeMeta model: the model
          :param str field: the field
          :return InstrumentedAttribute: the column to filter on