How to refactor a subscribe inside a subscribe in rxjs

问题

For example:

this.saveSubscription$ = this.ds.onSave$.subscribe(x => 
  this.sb.updateMachineTool(this.viewEditModel.viewEditModel).subscribe(x = {
    console.log('alert results', x)
  })
)

this.ds.onSave$ is a subject that triggers when a save button on a different component is clicked.

this.sb.updateMachineTool is an httpClient post that updates a specific tool

should I be using some type of map so i'm not subscribing to both areas?

How can I refactor this code?

回答1:

To Refactor your code You can use
mergeMap
switchMap

your question is the perfect use case for switchMap. because as you have mentioned this.ds.onSave$ is a subject that triggers when a save button on a different component is clicked.
The advantage switchMap gives you in this scenario is it will cancel all the old subscription(Http Call in Progress in your case) automatically if the button is clicked repeatedly.

ModifiedCode

this.saveSubscription$ = this.ds.onSave$.pipe(switchMap(()=> 
  this.sb.updateMachineTool(this.viewEditModel.viewEditModel)
  )
).subscribe(x = {
    console.log('alert results', x)
  });

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