/**
  * Let the logged in user change his password.
  *
  * @param array $options
  * @return void
  */
 public function changePassword($options = [])
 {
     $options = Hash::merge($this->_defaultConfig['changePassword'], $options);
     $entity = $this->UserTable->newEntity();
     $entity->accessible(['id', 'old_password', 'new_password', 'confirm_password'], true);
     if ($this->request->is(['post', 'put'])) {
         $entity = $this->UserTable->patchEntity($entity, $this->request->data);
         $entity->id = $this->_controller->Auth->user('id');
         $entity->isNew(false);
         if ($this->UserTable->changePassword($entity)) {
             $this->request->data = [];
             $entity = $this->UserTable->newEntity();
             $entity->id = $this->_controller->Auth->user('id');
             $entity->isNew(false);
             $this->handleFlashAndRedirect('success', $options);
         } else {
             $this->handleFlashAndRedirect('error', $options);
         }
     }
     $this->_controller->set('entity', $entity);
 }