/**
  * Delete user mapping
  *
  * @param void
  * @return null
  */
 function repository_user_delete()
 {
     if (!$this->request->isAsyncCall()) {
         $this->httpError(HTTP_BAD_REQUEST, null, true);
     }
     // if
     if (!$this->request->isSubmitted()) {
         $this->httpError(HTTP_BAD_REQUEST, null, true);
     }
     // if
     $repository_user = array_var($_POST, 'repository_user');
     $source_user = SourceUsers::findByRepositoryUser($repository_user, $this->active_repository->getId());
     if (!instance_of($source_user, 'SourceUser')) {
         die('false');
     }
     // if
     $deleted = $source_user->delete();
     if ($deleted && !is_error($deleted)) {
         die('true');
     }
 }