所以我今天花了大约 5 到 6 个小时来与 Symfony2 表单作斗争，现在我想从社区的其他成员那里得到一些建议。我尝试了 3 种不同的方法来实现我所追求的目标，但没有成功。我通读了文档，用谷歌搜索了所有内容，询问了其他人，而且我的情况只比开始时好一点。
我的用例
我正在建立一个系统，您可以在其中订购门票。但核心问题是如何设计系统的订单部分。

/**
 * @ORM\Entity(repositoryClass="Foo\BackendBundle\Entity\TicketsRepository")
 * @ORM\HasLifecycleCallbacks
 * @ORM\Table(name="tickets")
 */
class Tickets
{
    // id fields and others
    
    /**
     * @Assert\NotBlank
     * @ORM\Column(type="string", nullable=true)
     */
    protected $name;

    /**
     * @ORM\Column(type="date", name="available_from", nullable=true)
     */    
    protected $availableFrom;

    /**
     * @ORM\Column(type="date", name="available_to", nullable=true)
     */    
    protected $availableTo;
}

/**
 * @ORM\Table()
 * @ORM\Entity
 */
class OrderTicket
{
    // id field

    /**
     * @ORM\Column(name="quantity", type="integer")
     */
    private $quantity;

    /**
     * @ORM\ManyToOne(targetEntity="Tickets")
     */
    protected $ticket;

    /**
     * @ORM\ManyToOne(targetEntity="Orders", inversedBy="tickets")
     */
    protected $order;
    
    // getters and setters for quantity, ticket and order
}

/**
 * @ORM\Entity
 * @ORM\HasLifecycleCallbacks
 * @ORM\Table(name="orders")
 */
class Orders
{   
    // id field and other stuff
    
    /**
     * @ORM\OneToMany(targetEntity="OrderTicket", mappedBy="order", cascade={"persist"})
     **/
    protected $tickets;

    /**
     * @ORM\ManyToOne(targetEntity="Customer", cascade={"persist"})
     */
    protected $customer;

    public function __construct()
    {
        $this->tickets = new \Doctrine\Common\Collections\ArrayCollection();
    }
    
    // getters, setters, add for Tickets and Customer
}

/**
 * @ORM\Table()
 * @ORM\Entity
 */
class Customer
{
    // id, name, email, address fields

}

CREATE TABLE `tickets` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `available_from` date DEFAULT NULL,
  `available_to` date DEFAULT NULL,
  PRIMARY KEY (`id`)
);
CREATE TABLE `Customer` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `email` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `name` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
  `address` longtext COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`id`)
);
CREATE TABLE `OrderTicket` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ticket_id` int(11) DEFAULT NULL,
  `order_id` int(11) DEFAULT NULL,
  `quantity` int(11) NOT NULL,
  PRIMARY KEY (`id`)
);
CREATE TABLE `orders` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
);

class CustomerType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('email')
            ->add('name')
            ->add('address')
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Foo\BackendBundle\Entity\Customer'
        ));
    }

    public function getName()
    {
        return 'foo_backendbundle_customertype';
    }
}

class OrderTicketType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('quantity', 'integer')
            ->add('ticket')
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Foo\BackendBundle\Entity\OrderTicket'
        ));
    }

    public function getName()
    {
        return 'foo_backendbundle_ordertickettype';
    }
}

class OrdersType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('customer', new CustomerType())
            ->add('tickets', 'collection', array(
                'type' => new OrderTicketType(),
                'allow_add'    => true,
                'allow_delete' => true,
                'prototype'    => true,
            ))
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Foo\BackendBundle\Entity\Orders',
        ));
    }

    public function getName()
    {
        return 'foo_backendbundle_orderstype';
    }
}

<form action="{{ path('index') }}" method="post" {{ form_enctype(form) }}>
    <h3>Tickets</h3>

    {{ form_errors(form) }}

    <table>
        <thead>
            <tr>
                <td>Ticket</td>
                <td>Quantity</td>
        </thead>
        <tbody>
            {% for ticketrow in form.tickets %}
            <tr>
                <td>{{ form_widget(ticketrow.ticket) }}</td>
                <td>{{ form_widget(ticketrow.quantity) }}</td>
            </tr>
            {% endfor %}
        </tbody>
    </table>

    <h3>Customer</h3>

    {% for customer in form.customer %}
        {{ form_row(customer) }}
    {% endfor %}
</form>

class DefaultController extends Controller
{
    /**
     * @Route("/", name="index")
     * @Template()
     */
    public function indexAction(Request $request)
    {
        $em = $this->getDoctrine()->getManager();
        // IMPORTANT - the Tickets are prefiltered for active Tickets, these have to be injected into the Order atm. In other places I use this method on the query builder
        $tickets = $em->getRepository('FooBackendBundle:Tickets')->findActive();

        // check no tickets

        $order = new Orders();

        // To prepopulate the order with the available tickets, we have to do it like this, due to it being a collection,
        // rather than using the forms query_builder like everywhere else
        foreach($tickets as $ticket) {
            $ot = new OrderTicket();
            $ot->setTicket($ticket);
            $ot->setQuantity(0);
            $ot->setOrder($order);
            $order->addTicket($ot);
        }

        $form = $this->createForm(new OrdersType(), $order);

        if ($request->isMethod('POST')) {

            $form->bind($request);
            
            // IMPORTANT here I have to remove the previously added Tickets where the quantity is 0 - as they're not wanted in the Order.  Is there a better way to do this?
            // if the quantity of Ticket is 0, do not add to order
            // note we use the validation callback in Order to check total quantity of OrderTickets is > 0
            $order->removeTicketsWithNoQuantity();

            if ($form->isValid()) {
            
                $em->persist($order);
                $em->flush();

                return $this->redirect($this->generateUrl('order_show', array('id' => $order->getId())));
            }
        }

        return array('form' => $form->createView());
    }
}

最佳答案

基于以上代码的最简单的解决方案是为您的 Ticket 实体创建一个自定义类型，该类型仅将当前票证显示为标签，并为其创建一个数据转换器。

namespace WineVision\BackendBundle\Form\Type;

use Symfony\Component\Form\AbstractType;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Component\Form\FormBuilderInterface;

use WineVision\BackendBundle\Form\Transformer\TicketToIdTransformer;

class TicketLabelType extends AbstractType
{
    private $om;

    public function __construct(ObjectManager $om)
    {
        $this->om = $om;
    }

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $transformer = new TicketToIdTransformer($this->om);
        $builder->addViewTransformer($transformer);
    }    

    public function getParent()
    {
        return 'hidden';
    }

    public function getName()
    {
        return 'ticket_label_type';
    }    
}

{% block ticket_label_type_widget %}
    {% spaceless %}
    <input type="hidden" {{ block('widget_attributes') }} {% if value is not empty %}value="{{ value }}" {% endif %} />
    <span class="ticketName">{{ form.vars.data.ticketNameMethod }}</span>
    {% endspaceless %}
{% endblock %}

namespace WineVision\BackendBundle\Form\Transformer;

use Symfony\Component\Form\DataTransformerInterface;
use Symfony\Component\Form\Exception\UnexpectedTypeException;

use Doctrine\Common\Persistence\ObjectManager;

class TicketToIdTransformer implements DataTransformerInterface
{
    private $om;

    public function __construct(ObjectManager $om)
    {
        $this->om = $om;
    }

    public function transform($ticket)
    {
        if (null === $ticket) {
            return "";
        }

        if (!$ticket instanceof \WineVision\BackendBundle\Entity\Ticket) {
            throw new UnexpectedTypeException($ticket, '\WineVision\BackendBundle\Entity\Ticket');
        }


        return $ticket->getId();
    }

    public function reverseTransform($id)
    {

        if ('' === $id || null === $id) {
            return null;
        }

        return $this->om
                    ->getRepository('WineVisionBackendBundle:Ticket')
                    ->findOneBy(array('id' => $id));

    }
}

$builder->add('ticket', 'ticket_label_type');

关于php - Symfony2 表单和集合 - 一个 Order，OrderItem 实现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14242259/