docs: def get_attribute_by_name_and_dimension(name, dimension_id=None,**kwargs):
      """
          Get a specific attribute by its name.
          dimension_id can be None, because in attribute the dimension_id is not anymore mandatory
      """
      try:
          attr_i = db.DBSession.query(Attr).filter(and_(Attr.name==name, Attr.dimension_id==dimension_id)).one()
          log.debug("Attribute retrieved")
          return attr_i
      except NoResultFound:
          return None