map json with AngularHttpClient

问题

After updating my project to use the HttpClient module instead of the Http module, the following no longer works.

The problem is Property json does not exist on type object. I do need to get the items property. How can I achieve this?

private loadLatestVideosForChannelId( channelId: string ): Promise<any[]> {

    // load videos from youtube-data-api
    let videos = this.http.get( 
            'https://www.googleapis.com/youtube/v3/search' + 
            '?key=' + this.apiKey + 
            '&channelId=' + channelId + 
            '&part=snippet,id' + 
            '&order=date' + 
            '&type=video' +
            '&maxResults=3'
        )    
        .pipe(
            // if success
            map( res => {
                return res.json()['items'];    // the problem
            }),
            // if error
            catchError( (err) => {
                console.log( "YouTube API Error > Cannot get videos for this channel :(" )
                return null;
            }),
            take(1) 
        )
        .toPromise() as Promise<any[]>;

    return videos;
}

回答1:

You don't need to use .json() with HttpClient as the response itself already a json. change it as follows,

  this.http.get( 
            'https://www.googleapis.com/youtube/v3/search' + 
            '?key=' + this.apiKey + 
            '&channelId=' + channelId + 
            '&part=snippet,id' + 
            '&order=date' + 
            '&type=video' +
            '&maxResults=3'
  )    
  .pipe(
    map((res: any) => {
      return res['items'];
    })
  )

;

来源：https://stackoverflow.com/questions/54384961/map-json-with-angularhttpclient