如何使用两个concatMap？

Question

I have the following code:

event.afterClosed()
  .pipe((filter(Boolean), 
         concatMap(() => this.applicationSubjectsService.get(this.id),
         concatMap(() => this.applicationThemesService.get(this.id)
    )))

I would execute two sequence requests. How to get result from each and add to local variable?

I have tried this:

event.afterClosed()
  .pipe((filter(Boolean), 
         concatMap(() => this.applicationSubjectsService.get(this.id), finilize((response) =>  this.localSubjects = response),
         concatMap(() => this.applicationThemesService.get(this.id),
         finilize((response) =>  this.localThemes = response),
    )))

How to do that correctly and what should I change if I need execute at least one request?

Answer 1

You should be able to use the tap operator to hook into the result from the switchMap. You can read about the tap operator here: tap

event.afterClosed()
   .pipe((filter(Boolean), 
       concatMap(() => this.applicationSubjectsService.get(this.id)),
       tap((result) => this.localSubjects = result),
       concatMap(() => this.applicationThemesService.get(this.id)),
       tap((result) => this.localThemes = result))
)