$builder->add('category_id', 'entity', array(
            'class' => 'Eccube\Entity\Category',
            'property' => 'NameWithLevel',
            'query_builder' => function (EntityRepository $er) {
                return $er
                    ->createQueryBuilder('c')
                    ->orderBy('c.rank', 'DESC');
            },
            'empty_value' => '全ての商品',
            'empty_data' => null,
            'required' => false,
            'label' => '商品カテゴリから選ぶ',
        ));