docs: def add_permission(self, name):
          """
              Adds a permission to the backend, model permission
  
              :param name:
                  name of the permission: 'can_add','can_edit' etc...
          """
          perm = self.find_permission(name)
          if perm is None:
              try:
                  perm = self.permission_model(name=name)
                  perm.save()
                  return perm
              except Exception as e:
                  log.error(c.LOGMSG_ERR_SEC_ADD_PERMISSION.format(str(e)))
          return perm