从post api调用获取响应后,将引发错误=> .pipe不是函数 [英] After getting the response from post api call , an error is thrown => .pipe is not a function
问题描述
我正在进行api调用,并期望可以将其传递给第二个api调用,但出现错误
I am making an api call and expecting a response from it which can be passed to 2nd api call but I am getting an error
错误TypeError:this.helperService.getPointIdbyTags(...)[0] .pipe不是函数
ERROR TypeError: this.helperService.getPointIdbyTags(...)[0].pipe is not a function
在.pipe(switchMap((resarray:any)=> {
on line .pipe(switchMap((resarray:any)=>{
TS代码
someFunction(floor){
floor.entities.forEach(element => {
let desiredTempForZone;
this.getCurrentValue(element.name).subscribe((des) =>
{
currentTempForZone = des
});
console.log(currentTempForZone);
})
}
getCurrentValue(eleName){
let roomObj = this.getRoomObj(eleName);
let equipRef = roomObj.map(equip => equip.entities.filter(entity => entity.entities.length > 0)[0])[0];
return this.helperService.getPointIdbyTags(this.buildings, ['current',
'temp'], equipRef.referenceIDs.room)[0]
.pipe(switchMap((resarray:any)=>{
const res = resarray[0]
return this.siteService.getHisPointData(res, 'current')
.pipe(
map(this.helperService.stripHaystackTypeMapping),
)
}));
}
然后我尝试将其传递给
switchMap((resarray:any)=>{
const res = resarray[0]
return this.siteService.getHisPointData(res, 'current')
推荐答案
getPointIdbyTags(buildingObj: any, zoneTags: any, roomRef: string = undefined) { ... }
似乎是一个简单的函数,它返回一个数组.因此,无需使用.pipe()
和.switchMap
运算符,因为使用RXJS可以更轻松地编写异步或基于回调的代码.
It looks like that getPointIdbyTags(buildingObj: any, zoneTags: any, roomRef: string = undefined) { ... }
is a simple function which returns an array. So there is no need to use .pipe()
and .switchMap
operators because RXJS is used to make it easier to compose asynchronous or callback-based code.
您的代码应如下所示:
getCurrentValue(eleName){
let roomObj = this.getRoomObj(eleName);
let equipRef = roomObj.map(equip => equip.entities
.filter(entity => entity.entities.length > 0)[0])[0];
let res = this.helperService.getPointIdbyTags(this.buildings, ['current',
'temp'], equipRef.referenceIDs.room)[0];
// If this method `getHisPointData()` really makes HTTP call
// and if it returns observable than you can use `pipe` operator
return this.siteService.getHisPointData(res, 'current')
.pipe(
map(this.helperService.stripHaystackTypeMapping),
)
.subscribe(s => console.log(s));
}
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