Angular 在subscribe中调用subscribe的最佳方式是什么？

我需要调用API两次，首先找到密钥，然后用该密钥提取相关数据

我通过在subscribe中订阅来实现这一点，但发现这是一种糟糕的编程实践。我读过关于flapmap的文章，但是还没有正确地实现它

``打字稿

this.DrQue.clinicDoctorQueControllerFind('key', ({ "include": [{"relation":"patientQue"}] })).subscribe(data => {
      this.drQue = data;
      for (let i = 0; i < this.drQue.length; ++i) {
        if (this.componentDr == this.drQue[i].name) {
          this.indexDr = i;
          i = this.drQue.length + 1;
        }
      }
      this.patQue.patientQueCheckInControllerFind(this.drQue[this.indexDr].patientQue.id).subscribe(data => {
        for (let count = 0; count < data.length; ++count) {
          if (data[count].status == this.checkStatus){
            this.checkInArr.push(data[count]);
          }
        }
      });
    });

this.DrQue.clinicDoctorQueControllerFind（'key'，（{“include”：[{“relation”：“patientquee”}]}））.subscribe（数据=>{
this.drQue=数据；
for（设i=0；i{
for（让计数=0；计数

``试试这个：

this.DrQue.clinicDoctorQueControllerFind('key', ({ "include": [{"relation":"patientQue"}] }))
.pipe(
  switchMap((data) => {
     /**
     * Here we manipulate our data
     */
     this.drQue = data;
      for (let i = 0; i < this.drQue.length; ++i) {
        if (this.componentDr == this.drQue[i].name) {
          this.indexDr = i;
          i = this.drQue.length + 1;
        }
      }

     /**
     * Here we return new Observable stream
     */
     return this.patQue.patientQueCheckInControllerFind(this.drQue[this.indexDr].patientQue.id);

  })
).subscribe(data => {

    /**
     * Here we subscribe to the result and manipulate it
     */
    for (let count = 0; count < data.length; ++count) {
      if (data[count].status == this.checkStatus){
        this.checkInArr.push(data[count]);
      }
    }
});

this.DrQue.clinicDoctorQueControllerFind（'key'，（{“include”：[{“relation”：“patientQueue”}]}））
.烟斗(
开关映射（（数据）=>{
/**
*在这里，我们操纵我们的数据
*/
this.drQue=数据；
for（设i=0；i{
/**
*在这里，我们订阅结果并对其进行操作
*/
for（让计数=0；计数

一般来说，rxjs操作员是此类用例的朋友

在此处查找文档：

我建议在这种情况下使用switchMap和tap

this.DrQue.clinicDoctorQueControllerFind('key', ({ "include": [{"relation":"patientQue"}] })).pipe( 
   tap(data => {
       this.drQue = data;
       for (let i = 0; i < this.drQue.length; ++i) {
           if (this.componentDr == this.drQue[i].name) {
               this.indexDr = i;
               i = this.drQue.length + 1;
           }
        }
    }),
    switchMap(data => this.patQue.patientQueCheckInControllerFind(this.drQue[this.indexDr].patientQue.id)),
    tap(data => {
        for (let count = 0; count < data.length; ++count) {
            if (data[count].status == this.checkStatus){
                this.checkInArr.push(data[count]);
        }
    })
  ).subscribe();

this.DrQue.clinicDoctorQueControllerFind（'key'，（{“include”：[{“relation”：“patientQueue”}]}））.pipe（
点击（数据=>{
this.drQue=数据；
for（设i=0；ithis.patQue.patientQueCheckInControl智能驭享查找（this.drQue[this.indexDr].patientQuee.id）），
点击（数据=>{
for（让计数=0；计数

您可以根据需要使用或其他地图，而不是创建嵌套订阅。