async vote(id: string) {
    const post = this.posts.find(value => value.id === id);
    const index = this.posts.indexOf(post);
    post.votes = await VoteService.voteOnPost(this.http, id).then(value => {
      return value
    });
    this.posts[index] = post;
  }




  static voteOnPost(http: HttpClient, id: string) {
    return this.vote(http, 'post', id)
  }




  private static async vote(http: HttpClient, onWhat: string, id: string) {
    return <number> await http.get("http://localhost:8080/vote/" + onWhat + "/" + id,
      {headers: {'Authorization': localStorage.getItem('Authorization')}}).toPromise();
  }