错误：类型中缺少属性“包含”

Question

在连接服务器期间发生错误：

  

src / app / components / add-news / add-news.component.ts（29,5）中的错误：错误TS2322：键入'{title：string; dateCreated：日期； longText：字符串; }”不能分配给“ IAddNews []”类型。

     

类型'{title：string;中缺少属性'includes' dateCreated：日期； longText：字符串; }'。

     

src / app / components / add-news / add-news.component.ts（54,7）：错误TS2322：键入'{title：string; dateCreated：日期； longText：字符串; }”不能分配给“ IAddNews []”类型。

     

src / app / components / dashboard / dashboard / dashboard.component.ts（23,7）：错误TS2322：类型“对象”不能分配给类型“ IAddNews []”。

     

“对象”类型可分配给很少的其他类型。您是要改用“ any”类型吗？

     

类型“对象”中缺少属性“包含”。

代码： add-news.component.ts：

  ngOnInit() {
    this.news = this.setEmptyNews();
  }

  setEmptyNews() {
    return {
      title: '',
      dateCreated: new Date(),
      longText: ''
    };
  }


  addNews() {
    this.news.push(this.setEmptyNews());
  }

  removeNews(index) {
    if (this.news.length > 0) {
      this.news.slice(index, 1);
    }
  }

  onSubmit(addNewsForm) {
    this.http.post('http://project.usagi.pl/news', this.news, this.httpOptions) .toPromise() .then((response: IAddNews) => {
      console.log(response);
      this.news = this.setEmptyNews();
    });
  }

}

dashboard.component.ts：

@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss']
})
export class DashboardComponent implements OnInit {

  httpOptions = {
    headers: new HttpHeaders({
      'Content-Type': 'application/json',
      'Authorization': '70'
    })
  };

  news: IAddNews[];

  constructor(private http: HttpClient) {
    this.http.get('http://project.usagi.pl/news', this.httpOptions).toPromise().then((response) => {
      this.news = response;
      console.log(response);


    });
  }

  ngOnInit() {
  }

  removeNews(id){
    this.news = this.news.filter(({newsId}) => newsId !== id);
    this.deleteNewsServer(id);
    console.log(id);
  }
  deleteNewsServer(deleteNewsId) {
    this.http.post('http://project.usagi.pl/news/delete/' + deleteNewsId, this.news, this.httpOptions) .toPromise() .then((response: IAddNews) => {
      console.log(response);
    });
  }
}

IAddNews：

export class IAddNews {

  newsId?: string;
  title: string;
  longText: string;
  shortText?: string;
  dateCreated: any;