php - Symfony 2 嵌入式表单集合多对多

Question

我有 2 个实体 - 用户和组。它们是多对多的关系，Group用于存储用户的角色。

我正在尝试通过添加一个集合来创建一个用户编辑表单，我希望能够通过从下拉列表中选择它来添加一个新角色(仅限于数据库中已有的角色)

用户类型.php:

class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('username')
            ->add('email')
            ->add('forename')
            ->add('surname')
            ->add('isActive')
            ->add('joinDate', 'date', array('input' => 'datetime', 'format' => 'dd-MM-yyyy'))
            ->add('lastActive', 'date', array('input' => 'datetime', 'format' => 'dd-MM-yyyy'))
            ->add('groups', 'collection', array(
                    'type' => new GroupType(),
                    'allow_add' => true,
                    ))
        ;
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Sfox\CoreBundle\Entity\User'
        ));
    }
}

和GroupType.php:

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
                "data_class" => 'Sfox\CoreBundle\Entity\Group'
                ));
    }
}

这会在基本文本框中显示表单中的角色，但如果我向表单添加一个条目，它会将新条目级联保存到组中，如果我要编辑一个条目，它会更改基础组数据.

我尝试制作一个 GroupSelectType.php:

class GroupSelectType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('role', 'entity', array('class'=>'SfoxCoreBundle:Group', 'property'=>'name'));
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
                "data_class" => 'Sfox\CoreBundle\Entity\Group'
                ));
    }
}

将字段添加为“实体”类型，这会显示正确的选择框(但使用默认值)我似乎无法将其绑定(bind)到 UserType 表单!

我想让表单做的只是修改用户实体中的底层“组”ArrayCollection。

有谁知道我怎样才能做到这一点？

Answer 1

好吧，我为遇到类似问题的其他人制定了解决方案...

我必须创建自定义表单类型并将其声明为服务，这样我才能传入实体管理器。然后我需要制作一个 dataTransformer 以将我的组对象更改为表单的整数

自定义组选择类型:

class GroupSelectType extends AbstractType

{
    /**
     * @var ObjectManager
     */
    private $om;

    private $choices;

    /**
     * @param ObjectManager $om
     */
    public function __construct(ObjectManager $om)
    {
        $this->om = $om;

        // Build our choices array from the database
        $groups = $om->getRepository('SfoxCoreBundle:Group')->findAll();
        foreach ($groups as $group)
        {
            // choices[key] = label
            $this->choices[$group->getId()] = $group->getName() . " [". $group->getRole() ."]";
        }
    }

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

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
                "choices" => $this->choices,
                ));
    }

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

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

在构造函数中，我获取所有可用的组并将它们放入一个“选择”数组中，该数组作为一个选项传递给选择框。

您还会注意到我正在使用自定义数据转换器，这是为了将 groupId(用于呈现表单)更改为组实体。我也将 GroupSelectType 设为服务并传入 [@doctrine.orm.entity_manager]

services.yml(捆绑配置):

services:
    sfox_core.type.group_select:
        class: Sfox\CoreBundle\Form\Type\GroupSelectType
        arguments: [@doctrine.orm.entity_manager]
        tags:
          - { name: form.type, alias: group_select }

GroupToNumberTranformer.php

class GroupToNumberTransformer implements DataTransformerInterface
{
    /**
     * @var ObjectManager
     */
    private $om;

    /**
     * @param ObjectManager $om
     */
    public function __construct(ObjectManager $om)
    {
        $this->om = $om;
    }

    /**
     * Transforms an object (group) to a string (number).
     *
     * @param  Group|null $group
     * @return string
     */
    public function transform($group)
    {
        if (null === $group) {
            return "";
        }

        return $group->getId();
    }

    /**
     * Transforms a string (number) to an object (group).
     *
     * @param  string $number
     * @return Group|null
     * @throws TransformationFailedException if object (group) is not found.
     */
    public function reverseTransform($number)
    {
        if (!$number) {
            return null;
        }

        $group = $this->om
        ->getRepository('SfoxCoreBundle:Group')
        ->findOneBy(array('id' => $number))
        ;

        if (null === $group) {
            throw new TransformationFailedException(sprintf(
                    'Group with ID "%s" does not exist!',
                    $number
            ));
        }

        return $group;
    }
}

我修改过的 UserType.php - 注意我正在使用我的自定义表单类型“group_select”，因为它作为服务运行:

class UserType extends AbstractType
{
    private $entityManager;

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

    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $transformer = new GroupToNumberTransformer($this->entityManager);

        $builder
            ->add('username')
            ->add('email')
            ->add('forename')
            ->add('surname')
            ->add('isActive')
            ->add('joinDate', 'date', array('input' => 'datetime', 'format' => 'dd-MM-yyyy'))
            ->add('lastActive', 'date', array('input' => 'datetime', 'format' => 'dd-MM-yyyy'));
        $builder
            ->add(
                $builder->create('groups', 'collection', array(
                    'type' => 'group_select',
                    'allow_add' => true,
                    'options' => array(
                            'multiple' => false,
                            'expanded' => false,
                            )
                    ))
        );
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Sfox\CoreBundle\Entity\User'
        ));
    }

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