/// <summary>
 /// 新增
 /// </summary>
 /// <param name="entity"></param>
 /// <returns></returns>
 public JsonResult Add(Relation entity)
 {
     ModelState.Remove("ID");
     ModelState.Remove("CreatedTime");
     ModelState.Remove("UpdatedTime");
     ModelState.Remove("IsDelete");
     if (ModelState.IsValid)
     {
         if (IRelationService.IsExits(x => x.Name == entity.Name))
         {
             return(JResult(Core.Code.ErrorCode.system_name_already_exist, ""));
         }
         entity.CreatedTime = entity.UpdatedTime = DateTime.Now;
         var result = IRelationService.Add(entity);
         return(JResult(result));
     }
     else
     {
         return(ParamsErrorJResult(ModelState));
     }
 }