Tutorial CakePHP jour 3 >> Probleme dans la sauvegarde d'article

Bonjour,
je suis un débutant en cakePhp, j'ai suivi le tuto CakePHP 2 de grafikArt, je me suis tombé sur une erreur lors de la sauvegarde ou la suppression d'une article POST
qui a une relation avec User .
la sauvegarde s'effectue avec succès, mais ce message d'erreur apparaît :

Database Error

Error: SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'created' in where clause is ambiguous

SQL Query: SELECT COUNT(*) AS count FROM posts AS Post LEFT JOIN users AS User ON (Post.user\_id = User.id) LEFT JOIN categories AS Category ON (Post.category\_id = Category.id) WHERE Post.online = 1 AND created <= NOW() AND Post.category\_id = 1 AND created <= NOW()

Notice: If you want to customize this error message, create app\View\Errors\pdo_error.ctp

avant que je mets cette relation le système ça marche bien.

voici mon Post Model

<?php
class Post extends AppModel {
    public $hasMany = array(
        'Media' => array(
            'dependent' => true
        )
    );
    public $belongsTo = array(
        'User' => array(
            'className' => 'User',
            'foreignKey' => 'user_id'
        ),
        'Category' => array(
            'counterCache' => array(
                'post_count' => array('Post.online' => 1, 'created <= NOW()')
            )
        )
    );
    public $recursive = -1;
    public $order = 'Post.created DESC';
    public $validate = array(
        'slug' => array(
            'rule' => '/^[a-z0-9\-]+$/',
            'allowEmpty' => true,
            'message' => "L'URL n'est pas valide !"
        ),
        'name' => array(
            'rule' => 'notEmpty',
            'message' => 'Vous devez précisez un titre !'
        )
    );

    /*
     * AfterFind
     */
    function afterFind($data, $primary = false) {
        foreach ($data as $k => $d) {
            if (isset($d'Post']'slug']) && isset($d'Post']'id']) && isset($d'Post']'type'])) {
                $d'Post']'link'] = array(
                    'controller' => Inflector::pluralize($d'Post']'type']),
                    'action' => 'show',
                    'id' => $d'Post']'id'],
                    'slug' => $d'Post']'slug']
                );
            }
            $data$k] = $d;
        }
        return $data;
    }
    public function beforeSave($options = array()) {
        if (empty($this->data'Post']'slug']) && isset($this->data'Post']'slug']) && !empty($this->data'Post']'name'])) {
            $user_id = AuthComponent::user('id');

            $this->data'Post']'user_id'] = $user_id;
            $this->data'Post']'slug'] = strtolower(Inflector::slug($this->data'Post']'name'], '-'));
        }
        //($this->data);
        //die();
        return true;
    }
}

- le PostController

<?php
class PostsController extends AppController {
    public $uses = array('Post');
    public $helpers = array('Date');
    public $components = array('RequestHandler');
    public $paginate = array(
        'limit' => 5
    );

      /*
     * Index
     */
    function admin_index() {
        $this->paginate = array('Post' => array('limit' => 10, 'recursive' => 0));
        $d'posts'] = $this->Paginate('Post', array(
            'type' => 'post',
            'online >= 0',
        ));
        debug($d);
        $this->set($d);
    }
    /**
     * Editer 
     */
    function admin_edit($id = null) {
        if ($this->request->is('put') || $this->request->is('post')) {
            $data = $this->request->data'Post'];
            if ($this->Post->save($data)) {
                $this->Session->setFlash('Le contenu a été bien modifié', 'notif');
                $this->redirect(array('action' => 'index'));
            }
        } elseif ($id) {
            $this->Post->id = $id;
            $this->request->data = $this->Post->read();
        } else {
            $this->request->data = $this->Post->getDraft('post');
        }
        $d'categories'] = $this->Post->Category->find('list');
        $this->set($d);
    }
    /*
     * Supprimer
     */
    function admin_delete($id) {
        $this->Session->setFlash('L\'article a été bien supprimée', 'notif');
        $this->Post->delete($id);
        $this->redirect($this->referer());
    }
}
?>

- et voici la vue Admin_edit

<?php echo $this->Form->create('Post'); ?>
<?php echo $this->Form->input('name', array('label' => 'Titre')); ?>
<?php echo $this->Form->input('category_id', array('label' => 'Catégorie')); ?>
<?php echo $this->Form->input('slug', array('label' => 'URL')); ?>
<?php echo $this->Form->input('id'); ?>
<?php echo $this->Form->input('type', array('value' => 'post', 'type' => 'hidden')); ?>
<?php echo $this->Form->input('content', array('label' => 'Contenu')); ?>
<?php echo $this->Form->input('Post.created', array('label' => 'Date de publication','dateFormat' => 'DMY','timeFormat' => false)); ?>
<?php echo $this->Form->input('online', array('label' => 'En ligne ?','type' => 'checkbox')); ?>
<?php echo $this->Form->end('Envoyer'); ?>

Merci d'avance.