Is there a preferred method in RxJS for handling snapshotChanges()?

Currently, my code includes an auth.service.ts, crud.service.ts, and a components.ts. Although it functions correctly, it is a hodgepodge of various tutorials and documentation. I am seeking advice on how to streamline the code by centralizing all logic in crud.service.ts using rxjs operators. Ultimately, I aim to return a single observable of fully formatted item collections.

crud.service.ts 

 getTasks() {
   return this.auth.user$.pipe(
    switchMap((value: any) => this.db.collection(`users/${value.uid}/tasks`).snapshotChanges())
  )
}
component.ts

ngOnInit(): void {
    this.fireService.getTasks().subscribe((a: any) => {
      this.tasks = []
      a.forEach((b: any) => {
        let item: any = b.payload.doc.data();
        item.id = b.payload.doc.id;
        item.defaultState = true
        this.tasks.push(item)
      })
    })
}

Answer №1

Your platform must handle the data and format it accordingly:

 fetchUserTasks() {
   return this.authentication.user$.pipe(
    switchMap((data: any) => 
    this.database.collection(`users/${data.uid}/tasks`).snapshotChanges()),
    map( (values) => 
           values.map( (result) => {
              let task: any = result.payload.doc.data();
              task.id = result.payload.doc.id;
              task.defaultState = true;
              return task;
            }))
  )

In your component, simply set the received value in the subscription.

ngOnInit(): void {
    this.taskService.fetchUserTasks().subscribe((data: any) => {
      this.tasks = data;     
    })
}

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