Ajuda com AuthComponent

Hello everyone, I'm having trouble with the authentication system, the scenario is as follows: 

I have a database with two tables (Users and Posts) Posts in have a user-id field. 

My PostsController.php with add () function 

   <?php

   class PostsController extends AppController {

      public $uses = 'Post';

      public $name = 'Posts';

      public function index()

      {

         $this->set('posts', $this->Post->find('all'));

      }

      public function adicionar()

      {

if($this->request->is('post'))

         {

            if($this->Post->saveAll($this->request->data))

            {

               $this->Session->setFlash('O post foi adicionado com sucesso!');

               $this->redirect(array('action' => 'index'));

            } else {

               $this->Session->setFlash('O post não foi adicionado. Tente novamente!');

            }

         }

      }

And adicionar.ctp 

  <div class="users form">

<?php echo $this->Form->create('Post'); ?>

<fieldset>

<legend>Adicionar</legend>

<?php

echo $this->Form->input('title');

echo $this->Form->input('body');

?>

</fieldset>

<?php echo $this->Form->end('CRIAR POST'); ?>

</div>

<div class="actions">

<h3>Actions</h3>

<ul>

<li><?php echo $this->Html->link('Listar', array('action' => 'index')); ?></li>

</ul>

</div>

The problem is that the bank is not slavando logged the user who created the post, tried using the hasOne model but had no luck. 

Can you help me?

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