如何异步添加数据（需要迭代两次）到angular中的API服务？

Question

我有一个 json 文件，如下所示：

{
  "users": [
    {
      "id": "person1",
      "information": [
        {
        "first_name": "Mike",
        "last_name": "Patty",
        "address": ["address1","address2"]
        },
        {
          "first_name": "Mike2",
          "last_name": "Patty2",
          "address": ["address1","address2"]
        }
      ]
    },
    {
      "id": "person2",
      "information": [
        {
        "first_name": "Tom",
        "last_name": "Jerry",
        "address": ["address1","address2"]
        },
        {
          "first_name": "Tom2",
          "last_name": "Jerry2",
          "address": ["address1","address2"]
        }
      ]
    }
  ]
}

我想迭代用户并将每个用户的信息添加到API数据库中。 addInfo请求需要： first_name ， last_name和address （ address是数组）。 这是因为我需要保存信息请求的响应以供以后使用。 我对角度/打字稿很陌生。 所以这是我目前正在尝试编写的代码：

先感谢您！

Answer 1

forkjoin 需要一组 observables，执行 observables，并且当所有 onbservables 完成时返回每个的响应。 所以你应该创建这个 observables 数组。 为此，您将数组“用户”转换为调用数组 API。 为此，您使用“地图”（是“数组的地图”）

const addUsers$ = forkJoin(
User.map(x=>
  //each "x" is in the way {id:..,information:{first_name:..,last_name:..,address:..}
  this.APIservice.addInformation(
           {
              firstName: x.information.first_name,
              lastName: x.information.last_name,
              organizations: x.information.address
           }
      )).subscribe((res:any[])=>{
            //in res[0] you has the response to the first call API, 
            //in res[1] you has the response to the second one
            //...

      })

Answer 2

试试flatMap

const addUsers$ = forkJoin(
     Users.flatMap(user => user.information).map(info => 
       this.APIservice.addInformation(
           {
              firstName: info.first_name,
              lastName: info.last_name,
              organizations: info.address
           }
      )))
   );