PHP Symfony：如何在表单模板中访问getter-Constraint？

Mannimalte 发表于 Dev

Mannimalte

我创建了一个简单的实体类，其中包含一些属性，并创建了一个公共的getter-Method，该方法执行一些操作并返回true或false。

class Item {
    public prop1;
    public prop2;

    public function isGetterConstraint() {
        return true // or false based on some calculations
    }
}

然后，我在validation.yml中为该类定义了约束：

Foo\MyBundle\Entity\Item:
    properties:
        prop1:
            - NotBlank: ~
        prop2:
            - NotBlank: ~
    getters:
        getterConstraint:
            - "True": { message: "zu" }

这是在许多示例中看到的，但是我还没有找到如何在控制器或树枝模板中以某种形式访问此getter约束的方法。就我而言，我确实在模板中需要它。

如果我这样定义我的FormType

class ClientType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('prop1', 'text')
            ->add('prop2', 'text');
    }

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

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

和我的控制器一样

class ItemController extends Controller {
    public function createAction(Request $request) {
        $item = new Item();

        $form = $this->buildForm($item);
        $form->handleRequest($request);

        if ($form->isValid()) {
            // do some nice things like saving the data
        }
        return $this->render('FooMyBundle:Item:form.html.twig', array('form' => $form->createView());
    }
}

表单不了解getter约束，因此无法访问它，就像我习惯使用属性约束一样：

// form.html.thwig

{% if form.prop1.vars.errors %}{% endif %} // works

{% if form.getterConstraint.vars.errors %}{% endif %} // doesnot work

有没有一种方法可以将getter约束添加到FormType上，或者在验证数据并将结果公开给控制器或模板时，我必须做些什么才能使窗体考虑此约束？

哈里德·朱奈德（M Khalid Junaid）

您实际上可以直接在实体中使用getter约束

// src/Acme/BlogBundle/Entity/Author.php

// ...
use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints\True;

class Author
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addGetterConstraint('passwordLegal', new True(array(
            'message' => 'The password cannot match your first name',
        )));
    }
public function isPasswordLegal()
{
    return $this->firstName != $this->password;
}
}

演示代码取自Symfony验证

或者，您可以在实体中使用注释定义回调

// src/Acme/BlogBundle/Entity/Author.php

// ...

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\ExecutionContextInterface;

/**
 * @Assert\Callback(methods={"isPasswordLegal"})
 */
class Author
{
public function isPasswordLegal(ExecutionContextInterface $context)
{
    $context->addViolationAt('password', 'wrong password');
}  
}

在控制器中，您可以这样做

// src/KnpU/QADayBundle/Controller/EventController.php

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\ExecutionContextInterface;
use KnpU\QADayBundle\Entity\Event;
// ...
public function newAction(Request $request)
{
    $form = $this->createFormBuilder(null, array(
        'data_class' => 'KnpU\QADayBundle\Entity\Event',
        'constraints' => array(
            new Assert\Callback(array(array($this, 'validateEventDates')))
        )
    ))
        ->add('name', 'text')
        ->add('startDate', 'datetime')
        ->add('endDate', 'datetime')
        ->getForm()
    ;

    // ...
}

public function validateEventDates(Event $event, ExecutionContextInterface $context)
{
    $context->addViolationAt('startDate', 'There is already an event during this time!');
}