Learn TypeScript 3 by Building Web Applications

Implementing the song resolver and leverage NestJS features

Now we can finally complete the implementation of our GraphQL resolver for songs.

This resolver will be responsible for fetching and returning Song objects. To do so, it'll make use of MusicService, which is already available in the project. We have simply ported the existing code.

Create then open the backend/src/song/song.resolver.ts file and adapt it as follows:

import { Args, Query, Resolver } from '@nestjs/graphql'; 
import { MusicService } from '../musixmatch/services'; 
import { Inject } from '@nestjs/common'; 
import { TYPES } from '../musixmatch/ioc/types'; 
import { SongDto } from './song.dto'; 
import { Observable } from 'rxjs'; 
 
@Resolver('Song') export class SongResolver { ...