/**
  * Removes a candidate.
  * @param integer $userId
  * @param integer $electionId
  * @return mixed
  */
 public function actionRemoveCandidate($userId, $electionId)
 {
     Candidate::findOne(['user_id' => $userId, 'election_id' => $electionId])->delete();
     return $this->redirect(['view', 'id' => $electionId]);
 }