Connexion impossible

Bonjour,

J'essaye d'etablir une authetification à partir de mon controller users sous cake mais ma variable de login $user est tout le temps egale a false

Voici ce que j'ai fais

dans le 'usersController'

 public function beforeFilter(Event $event)
    {
        parent::beforeFilter($event);
        $this->Auth->allow(['add', 'logout']);
    }

    public function login()
    {
        if ($this->request->is('post')) {
            $user = $this->Auth->identify();
            debug($this->Auth->identify());
            die();
            if ($user) {
                $this->Auth->setUser($user);
                return $this->redirect($this->Auth->redirectUrl());
            }
            $this->Flash->error(__('Invalid username or password, try again'));
        }
    }

    public function logout()
    {
        return $this->redirect($this->Auth->logout());
    }

Dans le AppController

 public function initialize()
    {
        parent::initialize();

        $this->loadComponent('RequestHandler');
        $this->loadComponent('Flash');
        $this->loadComponent('Auth', [
            'authorize' => ['Controller'],
            'Form' => ['fields' => [
                'username' => 'username', 
                'password' => 'motDePasse']
            ],
            'loginRedirect' => [
                'controller' => 'Articles',
                'action' => 'index'
            ],
            'logoutRedirect' => [
                'controller' => 'Users',
                'action' => 'login',
                'home'
            ],
            'loginAction' => [
                'controller' => 'Users',
                'action' => 'login'
            ]        
        ]);
    }

    /**
     * Before render callback.
     *
     * @param \Cake\Event\Event $event The beforeRender event.
     * @return void
     */
    public function beforeRender(Event $event)
    {
        if (!array_key_exists('_serialize', $this->viewVars) &&
            in_array($this->response->type(), ['application/json', 'application/xml'])
        ) {
            $this->set('_serialize', true);
        }
    }

    public function beforeFilter(Event $event)
    {
        $this->Auth->config('authenticate', ['Form']);
        $this->Auth->allow(['index', 'view', 'edit']);
    }

Dans user.php

protected function _setPassword($password)
    {
        return (new DefaultPasswordHasher)->hash($password);
    }

Et dans le login.ctp

<div class="users form">
<?= $this->Flash->render('auth') ?>
<?= $this->Form->create() ?>
    <fieldset>
        <legend><?= __("Connectez vous?!") ?></legend>
        <?= $this->Form->input('login', ['name' => 'login']) ?>
        <?= $this->Form->input('motDePasse', ['type' => 'password' , 'name' => 'password' ]) ?>
    </fieldset>
<?= $this->Form->button(__('Se Connecter')); ?>
<?= $this->Form->end() ?>
</div>

Merci d'avance pout vos reponses :)