Angular http method calling inside method not getting any response

Question

I have these 2 backend call methods. When I try to debug these, after getting a response from isExisting method

updateDocumentHttp method is calling, but the response is not getting, the control just goes away. Is there any wrong I'm going, or is there any better solution for this?

 this.dataService.processUpdateDocument(isExistingUrl, isExistingCriteria).subscribe();
    
    
    @Injectable()
    export class DataService {

    processUpdateDocument(httpMethod, baseUrl, doc):Observable<any> {
if (httpMethod == 'POST') {
      return this.isExisting(isExistingUrl, isExistingCriteria);
    } else {
      return this.updateDocumentHttp(httpMethod, baseUrl, doc);
  }
}

     isExisting(isExistingUrl, isExistingCriteria): Observable<any>{
          return this.http.post(isExistingUrl, isExistingCriteria)
              .pipe(map((response:[]) =>{
                console.log("Already exist Result: " + response.length);
                if (response.length <= 0) {
                  return this.updateDocumentHttp(httpMethod, baseUrl, doc, options, domainToUpdate, callback, messages)
                 }
              
     }
    
      updateDocumentHttp(httpMethod, baseUrl, doc):Observable<any> {
         return this.http.request<IApiResponse>(httpMethod, baseUrl, {
          body: doc,
          responseType: "json"
         }).pipe(map(
                data => {
                  console.log("Created / Updated : Successfully");
                  if (!domainToUpdate) {
                    app.childScope["domain"] = data;
                  }
                  return true;
                }
            )
          });
      }
    
      }

rsangin · Accepted Answer · 2022-10-09 05:26:40Z

2

Observables won't execute if you don't subscribe to them. In this example, the return type of isExisting method is another observable which needs to be subscribed, so if you use the code below, It will work fine:

this.dataService.isExisting(isExistingUrl, isExistingCriteria)
    .subscribe(result => result.subscribe());

answered Oct 9, 2022 at 5:26

rsangin

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4 Comments

boycod3 Over a year ago

There is one more update to this question, im not directly calling the isExisting and updateDocumentHttp, There is an another method is calling based on the condtion.

rsangin Over a year ago

In this situation, It's better to use switchMap instead of map in isExisting method. switchMap operator would subscribe to the new observable and return the result of it, so you don't need to subscribe to it twice.

boycod3 Over a year ago

Thanks, do u have the code for my situation.

rsangin Over a year ago

No, but if you could provide stackblitz page for it, I would work on it.

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