Encargo Valor Fieldset

<?php
namespace Cadastro\Form;

use Cadastro\Entity\EncargoValor;
use Doctrine\Common\Persistence\ObjectManager;
use DoctrineModule\Stdlib\Hydrator\DoctrineObject;
use Zend\Form\Fieldset;
use Zend\InputFilter\InputFilterProviderInterface;
use Application\Filter\StrToFloat;

class EncargoValorFieldset extends Fieldset implements InputFilterProviderInterface
{

    public function __construct(ObjectManager $objectManager)
    {
        parent::__construct('valor');

        $this->setHydrator(new DoctrineObject($objectManager))->setObject(new EncargoValor());

        $this->add(array(
            'type' => 'Cadastro\Form\Element\Money',
            'name' => 'valorInicial',
            'options' => array(
                'label' => 'Valor inicial'
            ),
            'attributes' => array(
                'class' => 'form-control money'
            )
        ));

        $this->add(array(
            'type' => 'Cadastro\Form\Element\Money',
            'name' => 'valorFinal',
            'options' => array(
                'label' => 'Valor final'
            ),
            'attributes' => array(
                'class' => 'form-control money'
            )
        ));

        $this->add(array(
            'type' => 'Cadastro\Form\Element\Money',
            'name' => 'valorEncargo',
            'options' => array(
                'label' => 'Valor encargo'
            ),
            'attributes' => array(
                'class' => 'form-control money'
            )
        ));

    }

    /**
     * (non-PHPdoc)
     *
     * @see \Application\Model\Model::getInputFilter()
     */
    public function getInputFilterSpecification()
    {
        return [
            'id' => [
                'required' => false
            ],
            'valorInicial' => [
                'filters' => [
                    new StrToFloat()
                ]
            ],
            'valorFinal' => [
                'filters' => [
                    new StrToFloat()
                ]
            ],
            'valorEncargo' => [
                'filters' => [
                    new StrToFloat()
                ]
            ]
        ];
    }

}