edit on second click

some help with this ?

just edit on second click

my code

controller

public function admin_editar($id = null) 

{

if (!$id)

{

throw new MethodNotAllowedException("Datos Invalidos");

}

$post = $this->Post->findById($id);

if (!$post)

{

throw new MethodNotAllowedException("El post no se pudo encontrar");

}

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

{

$this->Post->id=$id;

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

{

$this->Session->setFlash('El Post ah sido actualizado con exito', 'default', array('class' => 'alert alert-success alert-dismissible', 'role' => 'alert'));

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

}

$this->Session->setFlash('El Post no pudo ser guardado', 'default', array('class' => 'alert alert-success alert-dismissible', 'role' => 'alert'));

}

if (!$this->request->data)

{

$this->request->data = $post;

}

$this->set('id',$id);

$categorias = $this->Post->Categoria->find('list');

$this->set('categorias',$categorias);

$users = $this->Post->User->find('list');

$this->set('users',$users);

}

view

 <section class="content">

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

                    <div class='row'>

                        <div class='col-md-12'>

                            <div class='box box-info'>

                                <div class='box-body pad'>

<?

                                        //echo $this->Form->hidden('id',array('value'=>$id));

                                        echo $this->Form->input('user_id', array('class' => 'form-control'));

                                        echo "<br>";

                                        echo $this->Form->input('categoria_id', array('class' => 'form-control'));

                                        echo "<br>";

                                        echo $this->Form->input('titulo', array('class' => 'form-control'));

                                        echo "<br>";

                                        echo $this->Form->textarea('post', array('class' => 'form-control'));

                                        echo "<br>";

?>

                                </div>

                            </div><!-- /.box -->

                    </div><!-- ./row -->

                    <?

                    echo $this->Form->submit('Editar',array('class' => 'btn btn-primary'));

                    ?>

                </section><!-- /.content -->

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