Error: The type 'Promise' cannot be assigned to the type 'Model' in Angular 2 when working with Firebase

I have a method in my bug service that retrieves a single record from Firebase based on the bugId provided:

// This method is located in bugservice.ts

   getBug(bugId: string): Promise<Bug> {

    return this.bugsDbRef
        .child(bugId)
        .once('value')
        .then(snapshot => {
            const bugInfo = snapshot.val() as Bug;
            bugInfo.id = snapshot.key;
        }) as Promise<Bug>;
}

In my bugDetail component, I inject the bug service and call the above method as follows:

export class BugDetailComponent implements OnInit, OnDestroy {

private subscription: Subscription;

private bugDetail: Bug = new Bug(null,null,null,null,null,null,null,null,null); // To be populated from the service call to getBug    
private bugId: string; // Obtained from the URL

constructor(private bugService: BugService, private activatedRoute: ActivatedRoute) { }

ngOnInit() {
    this.configureForm();

    this.subscription = this.activatedRoute.params.subscribe(
        (param: any) => {
            this.bugId = param['id'];
        });

    const t = this.bugService.getBug(this.bugId);

    console.log(t);

}
}

However, when I log t to the console, the following output is displayed:

https://i.sstatic.net/iyPKW.png

Replacing t with

this.bugDetail = this.bugService.getBug(this.bugId);

Results in the error message:

Type 'Promise' is not assignable to type 'Bug'. Property 'id' is missing in type 'Promise'.

Could someone please guide me on how to access the bug details fetched from the service within the BugDetail Component?

Answer №1

getBug is a method that returns a Promise<Bug>, meaning it returns a promise that will eventually resolve to a Bug object. Promises resolve asynchronously, and the resolved value can be accessed through the function passed to the promise's then method.

To assign the resolved bug object to this.bugDetail, you can do the following:

this.bugService
    .getBug(this.bugId)
    .then(bug => { this.bugDetail = bug; });

If you want to learn more about JavaScript Promises, you may find JavaScript Promises: an Introduction helpful.

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