The Angular 2 and TypeScript error stating that the argument of type response is not assignable is causing issues

In my Angular application, I have a service that includes a value defined as:

private client_comments  = new BehaviorSubject([]);

When attempting to update this value with the response from an HTTP request, I encountered the following error message:

Argument of type 'Response' is not assignable to parameter of type 'any[]'. Property 'length' is missing in type 'Response'

The code snippet for the API call that caused the issue is as follows:

this.http.get(final_url, o).subscribe( comments => {
  this.client_comments.next(comments)
})

I am seeking guidance on how to properly define the response type so that it recognizes it as an array. Can you advise me on how to do this?

angulartypescripthttp

Answer №1

this.client_comments.advance(comments.json() as YourType[])

Ensure that your subject is defined with the type YourType[] as well

Answer №2

If you are utilizing the @angular/http package (which is now considered outdated), visit https://angular.io/api/http/Http

Follow this example:

this.http.get(final_url, options)
    .map((response: Response) => response.json())
    .subscribe( comments: any[] => {
        this.client_comments.next(comments)
    });

If you are using the current and recommended @angular/common/http package, check out https://angular.io/guide/http

Here's how to use it:

this.http.get<any[]>(final_url, options)
    .subscribe( comments: any[] => {
        this.client_comments.next(comments)
    });

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