Implemented the interface in all responses

refr #132

src/models/responses/ResponseUser.ts

@@ -7,12 +7,20 @@ import {
 } from "class-validator";
 import { User } from '../entities/User';
 import { UserGroup } from '../entities/UserGroup';
+import { ResponseObjectType } from '../enums/ResponseObjectType';
+import { IResponse } from './IResponse';
 import { ResponsePrincipal } from './ResponsePrincipal';
 
 /**
  * Defines the user response.
 */
-export class ResponseUser extends ResponsePrincipal {
+export class ResponseUser extends ResponsePrincipal implements IResponse {
+    /**
+    * The responseType.
+    * This contains the type of class/entity this response contains.
+    */
+    responseType: ResponseObjectType = ResponseObjectType.USER;
+
     /**
      * The user's first name.
      */