Symfony2-NotBlank约束不适用于EntityType

Question

EntityType我的表单中有两个字段，并且都NotBlank分配了约束。

现在，我遇到了NotBlank一个问题，即约束不只对启用了一个字段起作用multiple => true。

$builder
    ->add('preferredCountries', EntityType::class, array(
        'required' => false,
        'class' => 'IndexBundle:Country',
        'property' => 'name',
        'empty_value' => 'Choose',
        'multiple' => true,
        'query_builder' => function (EntityRepository $er) {
            return $er->createQueryBuilder('c')
                ->where('c.name != :name')
                ->orderBy('c.name', 'ASC')
                ->setParameter('name', 'Other');
        },
        'constraints' => array(
            new NotBlank(array(
                'message' => 'blank!!!',
            )),
        )
    ))
    ->add('internshipProgram', EntityType::class, array(
        'required' => false,
        'class' => 'IndexBundle:InternshipProgram',
        'property' => 'name',
        'empty_value' => 'Choose',
        'constraints' => array(
            new NotBlank(array(
                'message' => 'blank!!!',
            )),
        )
    ))

在这种情况下，当我提交空值时，字段internshipProgram会报错，而prefferedCountries不是。

表格显示：

<div class="form-group col-xs-12">
    {{ form_label(current_internship_form.preferredCountries, 'Preferred countries', { 'label_attr': {'class': 'label-text'} }) }}
    {{ form_widget(current_internship_form.preferredCountries) }}
    <span class="error text-danger small">{{ form_errors(current_internship_form.preferredCountries) }}</span>
</div>
<div class="form-group col-xs-12">
    {{ form_label(current_internship_form.internshipProgram, 'What type of training agreement will you have?', { 'label_attr': {'class': 'label-text'} }) }}
    {{ form_widget(current_internship_form.internshipProgram, { 'id': 'internship_program', 'attr': {'class': 'form-control '}}) }}
    <span class="error text-danger small">{{ form_errors(current_internship_form.internshipProgram) }}</span>
</div>

我的代码中有错误吗？还是与选择多项选择有关？有没有人遇到过类似的问题，并且知道如何解决？

Answer 1

不能使用NotBlank上的限制EntityType与multiple设置为true。由于数组永远不会为空。您应该尝试使用这样的count约束：

$builder
    ->add('preferredCountries', EntityType::class, array(
        'required' => false,
        'class' => 'IndexBundle:Country',
        'property' => 'name',
        'empty_value' => 'Choose',
        'multiple' => true,
        'query_builder' => function (EntityRepository $er) {
            return $er->createQueryBuilder('c')
                ->where('c.name != :name')
                ->orderBy('c.name', 'ASC')
                ->setParameter('name', 'Other');
        },
        'constraints' => array(
               new Count(array(
                   'min' => 1,
                   'minMessage' => "Should not be blank"
               ))
            )
    ))
...