code: def replace(self, dictionary):
          
          for column in self.__table__.columns.keys():
              setattr(self, column, None)
          self.from_dict(dictionary)
docs: Set all attributes which correspond to the
          :class:`sandman.model.Model`'s columns to the values in *dictionary*,
          inserting None if an attribute's value is not specified.
  
          :param dict dictionary: A dictionary of attributes to set on the
              instance whose keys are the column names of the
              :class:`sandman.model.Model`'s underlying database table.