Angular5:批处理调用以获取json数组中文件的数据 [英] Angular5: batch calls to get data for a filed in a json array

问题描述

我有一个具有以下格式的json数据的数组

I have an array with json data in the below format

staff = [
{ "id"   : 1,
   "name" : "Robert"
},
{ "id"   : 2,
   "name" : "Peter"
}
]

我正试图得到这些人的任命.有一个API可以接受一组ID.我正尝试以30为批次获得指定.即，先发送30个对象并获得其指定并继续..我尝试保持for循环并传递30个对象，但未成功.

I am trying to get the designation of these people. There is an API which accepts group of ids. I am trying to get designations in batches of 30. i.e send first 30 objects and get their designations and go on.. I tried keeping a for loop and pass 30 objects but unsuccessful.

Designation API以以下格式提供数据.

Designation API gives data in the below format.

[
  {
    "staffId": "26",
    "designation": "PRA"
  },
  {
    "staffId": "25",
    "designation": "MRA"
  }
]

结果json

工作人员= [ {"id":1， 名称":罗伯特"， "staffDesignation":"PRA" }， {"id":2， "name":"Peter"， "staffDesignation":"MRA" } ]

staff = [ { "id" : 1, "name" : "Robert", "staffDesignation": "PRA" }, { "id" : 2, "name" : "Peter", "staffDesignation": "MRA" } ]

因此，在这里，我每获得30个批次的指定，就需要用该值更新人员记录.

So here for every 30 batches of designations that I get, I need to update the staff record with that value.

staff.component.ts

staff.component.ts

for(让i = 0; i< = this.staff.length; i ++){ this.staffService.getStaffDesignator(//应该传递30个对象).subscribe((designator)=> {//这里传递30个对象 //更新指定符逻辑 }， (err)=> {

for (let i = 0; i <= this.staff.length; i++) { this.staffService.getStaffDesignator(//should pass 30 objects).subscribe((designator) => { //Here pass 30 objects //update designator logic }, (err) => {

})

}

staff.service.ts

staff.service.ts

getStaffDesignator(staff)
{

    staff.forEach((staff, index) => {
      if (index === 0) {
        url = url + `?contactId=${staff.id}`;
      }
      else {
        url = url + `&contactId=${staff.id}`
      }
    }) //loop through the objects to get the staff id to pass to the APIcall

    return this.http.get(url, this.options)
      .map((res: Response) => {
        return res.json();
      })  //API call to get designations for staff

}

推荐答案

从API调用获取资源后，您就可以开始在过滤器阵列过程中工作了.

While you get res from API call then you can start to work in filter array process.

var filterArray = [];

this.http.post(url , param , header , function(err , response) => {
    // First way is to use map
    // You can use for loop 
    for(let i = 0 i < response.length ; i++){
         var obj = {
             id: response[i].staffId,
             name: response[i].name,
             staffDesignation: response[i].designation,
         }
         this.filterArray.push(obj);

         // Now you can call next API for another batch... 
    }
})

在这种情况下，建议您使用以下结构.

In this case , I suggest you can use this below structure.

第1步::排列30个批次的阵列.

step1 : Make a array of 30 batches.

第2步::用于Observable的循环.

for(let i = 0 ; i < this.array.length ; i++){       //Each i has batch of 30.

     // Hear observable will work as a promise in for loop to make call in sync.
     return new Observable((observer) => {
          return http.post(url , param , option)...

         //Once you got data from API use my above code to filter your
         // Key and value from res. 

        observable.next();
        observable.complete(); // It will go for call next batch... 
     })
}

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