CODEWITHSUNDEEP
angulartypescriptrxjsangular2-observables
Boris K
Boris K

Reputation: 3580

Angular 2 error:Supplied parameters do not match any signature of call target

I'm building a RESTful service in my Angular 2 app to connect to a remote back end.

My GET (all) /POST methods seem to be fine, and my PUT method seems to be fine, but my GET (single object) method, which looks just like the PUT one, throws the above error: Supplied parameters do not match any signature of call target.

This throws an error during compilation: 

    getCourse (course: Course): Observable<Course> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
    let courseUrl = this.BaseUrl + '/' + course.id;
    return this.http.get(courseUrl, { course }, options)
                .map(this.extractData)
                .catch(this.handleError);
    }

This works:

put(course: Course): Observable<Course> {
    let headers = new Headers({ 'Content-Type': 'application/json' });
    let options = new RequestOptions({ headers: headers });
    let courseUrl = this.BaseUrl + '/' + course.id;
    return this.http.put(courseUrl, { course }, options)
                .map(this.extractData)
                .catch(this.handleError);
    }

Thoughts? What am I doing wrong?

Upvotes: 1

Views: 2367

Answers (1)

G&#252;nter Z&#246;chbauer
G&#252;nter Z&#246;chbauer

Reputation: 657308

get doesn't support a body parameter

return this.http.get(courseUrl, { course }, options)

should be

return this.http.get(courseUrl, options)

https://angular.io/docs/ts/latest/api/http/index/Http-class.html#!#get-anchor

get(url: string, options?: RequestOptionsArgs) : Observable

https://angular.io/docs/ts/latest/api/http/index/Http-class.html#!#put-anchor

put(url: string, body: any, options?: RequestOptionsArgs) : Observable

Upvotes: 2

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