/**
* Deletes an existing Project model.
* If deletion is successful, the browser will be redirected to the 'index' page.
* @param integer $id
* @return mixed
*/
public function actionDelete($id)
{
$this->findModel($id)->delete();
Registration::deleteAll(['project_id' => $id]);
ProjectVacancy::deleteAll(['project_id' => $id]);
Yii::$app->getSession()->setFlash('success', 'El proyecto se ha eliminado exitosamente.');
return $this->redirect(['index']);
}