Create.php

<?php
/**
 * @author Jonas Eriksson <[email protected]>
 * @author Antoine Hedgecock <[email protected]>
 */

/**
 *
 */
namespace Article\Form\Admin;
use Zend\ServiceManager\ServiceManager,
    Zend\ServiceManager\ServiceManagerAwareInterface,

    Zend\Form\Form,
    Zend\InputFilter\InputFilter;

class Create extends Form implements ServiceManagerAwareInterface
{
    public function __construct()
    {
        parent::__construct('article_create');

        $this->setAttribute('method', 'post')
             ->setHydrator(new \Zend\Stdlib\Hydrator\ClassMethods())
             ->setInputFilter(new InputFilter());

        $this->add(array(
            'type' => 'Article\Form\Fieldsets\ArticleFieldset',
            'options' => array(
                'use_as_base_fieldset' => true
            )
        ));
    }

    /**
     * @param ServiceManager $serviceManager
     */
    public function setServiceManager(ServiceManager $serviceManager)
    {
        // Set the hydrator from the service manager
        $this->setHydrator($serviceManager->get('EntityHydrator'));

        $categories = $serviceManager->get('article_service_category')
                                     ->fetchAll(array('sort' => array('name' => 'ASC')));

        foreach($categories as $category) {

            $values[$category['name']] = $category['id'];
        }

        // Get the fieldset and set the categories..
        $this->get('article')
             ->get('category_id')
             ->setAttribute('options', $values);

        $this->get('article')
             ->get('author')
             ->setAttribute('value', $serviceManager->get('user_service_auth')->getIdentity()->getId());
    }
}