如何避免秋田商店中的重复条目?

how to avoid duplicate entries in akita store?

在发送 API 插入请求之前,我想检查商品是否已存在于商店中,如果不存在,则只发送插入请求。

add(){
   const item = {id: 4,name:'test1',description:'description'}

   // here i want to check whether test1 already exist or not

   this.store.add(item);
   this.httpService.insert(item).subscribe(
   result => {
    this.messageService.handleSuccess('inserted');
    this.store.updateId(id, result.id);
  },
  error => this.messageService.handleError('error on insert:', error)
);

有人可以帮忙吗?

您可以使用查询:

add(){
   const item = {id: 4,name:'test1',description:'description'}

   if(query.hasEntity(4)) {
     // exists
   }

   this.store.add(item);
   this.httpService.insert(item).subscribe(
   result => {
    this.messageService.handleSuccess('inserted');
    this.store.updateId(id, result.id);
  },
  error => this.messageService.handleError('error on insert:', error)
);