The 'subscribe' property is not available on the type '() => Observable<any>'

File for providing service:

import { Observable } from 'rxjs/Rx';
import { Http, Response} from '@angular/http';
import { Injectable } from '@angular/core';
import 'rxjs/add/operator/Map';

@Injectable()
export class VideoService {

   private apiUrl = '/api/videos';
   
   constructor(private _http:Http) { }

   getVideos() {
       return this._http.get(this.apiUrl).map((response:Response) => {
          response.json()
       });
   }
}

Here is where the error occurs when using the subscribe method:

import { VideoService } from '../video.service';
import { Component, OnInit } from '@angular/core';
import { Video } from '../video';
import { Observable } from 'rxjs/Observable';


@Component({
    selector: 'app-videocenter',
    templateUrl: './videocenter.component.html',
    styleUrls: ['./videocenter.component.css']
})
export class VideocenterComponent implements OnInit {
    videos: any;
    selectedVideo: Video;
    showVideo: boolean = false;

    constructor(private videoService: VideoService) {
        
    }
    
    onSelect(video: any) {
        this.showVideo = true;
        this.selectedVideo = video;
    }
    
    ngOnInit() {
         this.videos = this.videoService.getVideos().subscribe((response) => {
             this.videos = response;
         });
    }

}

In my service file, I make an API call to fetch videos. When I try to subscribe to this method in another class that calls the `getVideos()` method from the service, it throws an error saying that the property "subscribe" does not exist on type '()=>Observable'.

Answer №1

Make sure you are correctly utilizing the getVideos method. It seems like you are mistakenly calling subscribe on the function reference of getVideos instead of the returned value. Remember to call subscribe after invoking getVideos():

ngOnInit() {
    this.videoserv.getvideos().subscribe((response) => {
         this.videos = response
    });
}

Answer №2

ngOnInit() {
    this.videoserv.retrieveVideos().subscribe((data) => {
         this.videoList = data
    });
}

Remember to use the parentheses when calling the retrieveVideos() method from the videoserv service. The method retrieveVideos is a function, not just a property.

Answer №3

this.function.call().response()...

Whenever this.function is entered and auto complete pops up, the method name is suggested without parentheses. Once the suggestion is selected, it only shows the method name without parentheses.

this.function.method.result().. => Will result in an error

this.function.method().result()..
=> Correct way to write it

Answer №4

However, if you wish to utilize your service method getvideos() in a different location within your application (such as a component or pipe), consider using .pipe(map()) instead of .subscribe()

ngOnInit() {
    this.videoserv.getvideos().pipe(map(response) => {
         this.videos = response
    }));
}

Then, utilize .subscribe where you want to access your videos:

   this.videoserv.getvideos().subscribe(response) => {
         this.videos2 = response
    });

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