gistfile1.txt

<?php
/**
  * @var \App\View\AppView $this
  */
$this->start('script');
echo '$().ready(function() {
            $( "#cadForm" ).submit(function( event ) {
                var request = $.ajax({
                    url: "",
                    method: "POST",
                    data: {  name: $("#name").val(),
                            email: $("#email").val(),
                            password: $("#password").val() },
                    dataType: "json"
                });

                request.done(function( msg ) {
                  $alert( msg );
                });

                request.fail(function( jqXHR, textStatus ) {
                  alert( "Request failed: " + textStatus );
                });
            });
        });';
$this->end();
?>

<nav class="large-3 medium-4 columns" id="actions-sidebar">
    <ul class="side-nav">
        <li class="heading"><?= __('Actions') ?></li>
        <li><?= $this->Form->postLink(
                __('Delete'),
                ['action' => 'delete', $user->id],
                ['confirm' => __('Are you sure you want to delete # {0}?', $user->id)]
            )
        ?></li>
        <li><?= $this->Html->link(__('List Users'), ['action' => 'index']) ?></li>
    </ul>
</nav>
<div class="users form large-9 medium-8 columns content">
    <?= $this->Flash->render() ?>
    <?= $this->Form->create($user, ['id'=> 'editUser']) ?>
    <fieldset>
        <legend><?= __('Edit User') ?></legend>
        <?php
            echo $this->Form->control('name');
            echo $this->Form->control('email');
            echo $this->Form->control('password');
            echo $this->Form->control('admin');
            echo $this->Form->control('picture');
        ?>
    </fieldset>
    <?= $this->Form->button(__('Submit')) ?>
    <?= $this->Form->end() ?>
</div>

gistfile2.txt

public function edit($id = null)
    {   
        if($id === null)
            $id = $this->Auth->user('id');
        $user = $this->Users->get($id, [
            'contain' => []
        ]);
        if ($this->request->is(['patch', 'post', 'put', 'ajax'])) {
            $this->render(false);
            $user = $this->Users->patchEntity($user, $this->request->getData());
            if ($this->Users->save($user)) {
                $response = $this->response;
                $response = $response->withStringBody('error');
                return $response;
                //$this->Flash->success(__("Usuario salvo com sucesso."));
                //return $this->redirect(['action' => 'view']);
            }
            if($user->errors()){
                $response = $this->response;
                $response = $response->withType('application/json');
                $response = $response->withStringBody('error');
                return $response;
                //$this->Flash->error(__($user->errors()));
            }
            exit();
        }
        $this->set(compact('user'));
        $this->set('_serialize', ['user']);
    }