docs: def get_perm_by_code(perm_code,**kwargs):
      """
          Get a permission by its code
      """
  
      try:
          perm = db.DBSession.query(Perm).filter(Perm.code==perm_code).one()
          return perm
      except NoResultFound:
          raise ResourceNotFoundError("Permission not found (perm_code={})".format(perm_code))