Angular2 http put方法不发送formData

Question

I'm trying to send a PUT request from Angular2 (using typescript) to an API made with Laravel. I'm doing it with the FormData class because this is how I can attach a file to the request. The POST method is working great, but when I try to update my model with a PUT method the API receives an empty request.

I've made some debugging and the FormData contains the data as expected, so I'm almost sure that my data is getting lost at the PUT request.

Service:

import {Http, Headers, Response, RequestOptions} from "@angular/http";

@Injectable()
export class SensorService {

public data: Data[] = [];
public sensors: Sensor[] = [];

constructor(private http: Http,
          private authService: AuthService) {

}

updateSensor(id: number, nombreNevera: string, ciudad: string, empresa_id: number,
           tipoSensor: string, telefonoMarcado: number,
           telefonoMarcadoB: number = null, telefonoMarcadoC: number = null,
           telefonoMarcadoD: number = null, fechaCalibracion: number = null,
           temMax: number = null, temMin: number = null, humeMax: number = null,
           humeMin: number = null, correos: any = null, fileToUpload: any = null) {

let formData: FormData = new FormData();

formData.append('nombreNevera', nombreNevera);
formData.append('cuidad', ciudad);
formData.append('empresa_id', empresa_id);
formData.append('tipoSensor', tipoSensor);
formData.append('telefonoMarcado', telefonoMarcado);
formData.append('telefonoMarcadoB', telefonoMarcadoB);
formData.append('telefonoMarcadoC', telefonoMarcadoC);
formData.append('telefonoMarcadoD', telefonoMarcadoD);
formData.append('fechaCalibracion', fechaCalibracion);
formData.append('humeMax', humeMax);
formData.append('humeMax', humeMin);
formData.append('temMin', temMin);
formData.append('temMax', temMax);
formData.append('correos', JSON.stringify(correos));

if (fileToUpload != null) {
  formData.append('certificado', fileToUpload, fileToUpload.name);
}

const headers = new Headers({
  'X-Requested-With': 'XMLHttpRequest'
});

return this.http.put(APPCONSTANTS.API_ENDPOINT + 'user/sensor/edit/' + id + '?token=' + this.authService.getToken(),
  formData,
  {headers: headers})
  .map((response: Response) => {
    return {
      msg: response.json().msg
    };
  });

}

}

Laravel returns an "Unprocessable Entity" because of the required fields in the controller.

Answer 1

you can make put request like this

let headers = new Headers({ 'Content-Type': 'application/json', 
                                         'Accept': 'application/json;' });

         let options = new RequestOptions({ headers: this.headers });

     let body = JSON.stringify(formData);

    return this.http.put(APPCONSTANTS.API_ENDPOINT + 'user/sensor/edit/' + id + '?token=' + this.authService.getToken(),
      body ,options)
      .map((response: Response) => {
        return {
          msg: response.json().msg
        };
      });

Answer 2

Z. Bagley made me think that this could be a Laravel related problem and in fact it is. There's this bug causing errors when using multipart/form-data and a PUT request.

I solved the problem sending a POST request and adding _method to the form, ending with a request like this:

formData.append('_method', 'PUT');

const headers = new Headers({
  'X-Requested-With': 'XMLHttpRequest'
});
return this.http.post(APPCONSTANTS.API_ENDPOINT + 'user/sensor/edit/' + id + '?token=' + this.authService.getToken(),
  formData,
  {headers: headers})
  .map((response: Response) => {
    return {
      msg: 'sensor_updated'
    };
  });

You can let the Laravel API to listen for a PUT request:

Route::put('/sensor/edit/{id}', [
    'uses' => 'NeveraController@update'
])->middleware('jwt.auth');