code: def add_permission_view_menu(self, permission_name, view_menu_name):
          
          if not (permission_name and view_menu_name):
              return None
          pv = self.find_permission_view_menu(
              permission_name,
              view_menu_name
          )
          if pv:
              return pv
          vm = self.add_view_menu(view_menu_name)
          perm = self.add_permission(permission_name)
          pv = self.permissionview_model()
          pv.view_menu, pv.permission = vm, perm
          try:
              pv.save()
              log.info(c.LOGMSG_INF_SEC_ADD_PERMVIEW.format(str(pv)))
              return pv
          except Exception as e:
              log.error(c.LOGMSG_ERR_SEC_ADD_PERMVIEW.format(str(e)))
docs: Adds a permission on a view or menu to the backend
  
              :param permission_name:
                  name of the permission to add: 'can_add','can_edit' etc...
              :param view_menu_name:
                  name of the view menu to add