In my Api service I have this simple getUsers
function to fetch all of the users on the api.
public getUsers(url: string): Observable<IUser[]> {
return this._http.get(url);
}
This is my IUser interface, I have made all the field optional for now.
export interface IUser {
id?: string;
first_name?: string;
last_name?: string;
location?: string;
followers?: string;
following?: string;
checkins?: string;
image?: string;
}
and here is how I have used the service in my component:
export class SocialOverviewContainerComponent implements OnInit {
public userData = [];
public showForm = {};
private _apiService: ApiService;
constructor(apiService: ApiService) {
this._apiService = apiService
}
public ngOnInit(): void {
this.getUsersData();
}
public getUsersData() {
this._apiService.getUsers(ApiSettings.apiBasepath + 'users/')
.subscribe(users => {
this.userData = users;
})
}
}
and this is is the Type error I get when it compiles
ERROR in src/app/services/api.service.ts(18,5): error TS2322: Type 'Observable<Object>' is not assignable to type 'Observable<IUser[]>'.
Type 'Object' is not assignable to type 'IUser[]'.
The 'Object' type is assignable to very few other types. Did you mean to use the 'any' type instead?
Property 'includes' is missing in type 'Object'.
I thought this might be because my response doesn't match the interface, which I have double check and it does. And I have also made the field optional for now to make sure.
I know I can fix this by casting the observable as any, but doesn't that defeat the point of using Typescript?
Any help on where I am going wrong would be great
Thanks in advance
There are two ways to do this, and it depends on which version of RxJS / Angular that you are using. Here are the two ways to do it depending on your versions:
// Using RxJS v4 / Angular v2-4. I assume that you're using the HttpModule...
import 'rxjs/add/operator/map';
public getUsers(url: string): Observable<IUser[]> {
return this._http.get(url)
.map((response: Response) => <IUser[]>response.json());
}
// Using RxJS v5 / Angular 5+ (at the moment). I assume that you're using the HttpClientModule, as the HttpModule was deprecated in Angular v4.
public getUsers(url: string): Observable<IUser[]> {
return this._http.get<IUser[]>(url);
}