Implemented permission getting

ref #6

src/models/responses/ResponseUser.ts

@@ -1,24 +1,19 @@
 import {
     IsArray,
     IsBoolean,
-    IsInt,
+
     IsOptional,
     IsString
 } from "class-validator";
 import { Permission } from '../entities/Permission';
 import { User } from '../entities/User';
 import { UserGroup } from '../entities/UserGroup';
+import { ResponsePrincipal } from './ResponsePrincipal';
 
 /**
  * Defines a user response.
 */
-export class ResponseUser {
-    /**
-     * Autogenerated unique id (primary key).
-     */
-    @IsInt()
-    id: number;;
-
+export class ResponseUser extends ResponsePrincipal {
     /**
      * The user's first name.
      */
@@ -80,7 +75,7 @@ export class ResponseUser {
     permissions: Permission[];
 
     public constructor(user: User) {
-        this.id = user.id;
+        super(user);
         this.firstname = user.firstname;
         this.middlename = user.middlename;
         this.lastname = user.lastname;