Wp to cake

// WpUser.php model
<?php
App::uses('AppModel', 'Model');
require(DIRNAME(ROOT).WP_DIR.'wp-load.php');
class WpUser extends AppModel {

}

// User controller: login
public function login() {
		$this->loadModel('WpUser');
		if($this->Auth->user()){
			if($this->Auth->user('role') == 'follower'){
				$this->redirect(array('controller' => 'users','action' => 'follower'));
			}else{
				$this->redirect(array('controller' => 'users','action' => 'index'));
			}
		}

		if ($this->request->is('post')) {
			if (null == user_exists($this->data['User']['email'])) {
	        		debug('null'); die;
	        	}
	        if ($this->Auth->login()) {
	        	// check wp user, if null then create new
	        	if($this->Auth->user('role') == 'follower'){
					return $this->redirect(array('controller' => 'users','action' => 'follower'));
				}else{
					return $this->redirect($this->Auth->redirect());
				}
	            
	        }
	        $this->Session->setFlash(__('Invalid username or password, try again'),'auth_message',array('status' => 'danger'),'auth');
	    }
	}