how to customize the view in cakephp 2 - cakephp

Question

I am trying to create a car rental site, I lived a problem when the client reserve a car, the car must be removed from the window of available cars after reservation, I have a table 'cars 'and table' locations', what I want is when the client rent a car, the car must be removed from the list of cars for rent, here are the pages : /view/cars/index.ctp, /view/cars/view.ctp, /LocationsController.php, CarsController.php
view/cars/index.ctp :
<div class="row">
<?php foreach ($cars as $car):?>
<div class="col-sm-6 col-md-4">
<div class="">
<?php echo $this->Html->link($this->Html->image($car['Car']['avatar']),
array('action'=>'view',$car['Car']['id']),
array('escape'=>false,'class'=>'thumbnail'));?>
<div class="caption">
<h5>
<?php echo $car['Car']['title'];?>
</h5>
<h5>
Price: $
<?php echo $car['Car']['price'];?>
</h5>
<h5><?php echo $this->Html->link(__('Rent a Car'), array('controller'=>'cars','action' => 'view', $car['Car']['id'])); ?></h5>
</div>
</div>
</div>
<?php endforeach;?>
and the view/cars.view.ctp :
<div class="cars view">
<h2><?php echo __('Car'); ?></h2>
<dl>
<dt><?php echo __('Id'); ?></dt>
<dd>
<?php echo h($car['Car']['id']); ?>
</dd>
<dt><?php echo __('Picture'); ?></dt>
<dd>
<?php echo h($car['Car']['picture']); ?>
</dd>
<dt><?php echo __('Price'); ?></dt>
<dd>
<?php echo h($car['Car']['price']); ?>
</dd>
</dl>
</div>
<?php
echo $this->Html->image("cars/".$car['Car']['id'].".jpg", array(
"alt" => "Cars",
'url' => array('controller' => 'locations', 'action' => 'add', $car['Car']['id'])
));
?>
//and the CarsController :
<?php
App::uses('AppController', 'Controller');
class CarsController extends AppController {
public $components = array('Paginator', 'Session');
public $helpers = array('Js', 'GoogleMap');
public function view($id = null){
if (!$this->Car->exists($id)) {
throw new NotFoundException(__('Invalid car'));
}
$options = array('conditions' => array('Car.' . $this->Car->primaryKey => $id));
$this->set('car', $this->Car->find('first', $options));
}
public function index() {
$this->set('cars', $this->Car->find('all'));
}
}
//and the LocationsController
<?php
App::uses('AppController', 'Controller');
class LocationsController extends AppController {
public $components = array('Paginator', 'Session');
public $helpers = array(
'Js',
'GoogleMap'
);
public function index() {
$this->Location->recursive = 0;
$this->set('locations', $this->Paginator->paginate());
}
public function view($id = null) {
if (!$this->Location->exists($id)) {
throw new NotFoundException(__('Invalid location'));
}
$options = array('conditions' => array('Location.' . $this->Location->primaryKey => $id));
$this->set('location', $this->Location->find('first', $options));
}
public function add($car_id) {
if ($this->request->is('post')) {
$this->Location->create();
if ($this->Location->save($this->request->data)) {
$this->Session->setFlash(__('The location has been saved.'));
return $this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash(__('The location could not be saved. Please, try again.'));
}
}
$users = $this->Location->User->find('list');
$agencies = $this->Location->Agency->find('list');
/*$cars = $this->Location->Car->find('list');*/
$this->set(compact('agencies'));
$this->set('car_id', $car_id);
}
public function edit($id = null) {
if (!$this->Location->exists($id)) {
throw new NotFoundException(__('Invalid location'));
}
if ($this->request->is(array('post', 'put'))) {
if ($this->Location->save($this->request->data)) {
$this->Session->setFlash(__('The location has been saved.'));
return $this->redirect(array('action' => 'index'));
} else {
$this->Session->setFlash(__('The location could not be saved. Please, try again.'));
}
} else {
$options = array('conditions' => array('Location.' . $this->Location->primaryKey => $id));
$this->request->data = $this->Location->find('first', $options);
}
$users = $this->Location->User->find('list');
$agencies = $this->Location->Agency->find('list');
$cars = $this->Location->Car->find('list');
$this->set(compact('users', 'agencies', 'cars'));
}
public function delete($id = null) {
$this->Location->id = $id;
if (!$this->Location->exists()) {
throw new NotFoundException(__('Invalid location'));
}
$this->request->allowMethod('post', 'delete');
if ($this->Location->delete()) {
$this->Session->setFlash(__('The location has been deleted.'));
} else {
$this->Session->setFlash(__('The location could not be deleted. Please, try again.'));
}
return $this->redirect(array('action' => 'index'));
}
}