在表单侦听器中修改查询构建器

Question

我创建了这样的自定义类型：

private  $selectedCountryId = 0;

public function configureOptions(OptionsResolver $resolver)
{
    $queryBuilder = function (CountryRepository $er) {
        return $er->createQueryBuilder('c')
            ->where('c.active = 1')
            ->orWhere('c.id = :sid')
            ->orderBy('c.ord', 'ASC')
            ->addOrderBy('c.name', 'ASC')
            ->setParameter('sid', $this->selectedCountryId)
            ;
        };


    $resolver->setDefaults(array(
        'query_builder' => $queryBuilder,
        'class' => Country::class,            
    ));
}
public function getParent()
{
    return EntityType::class;
}

public function getBlockPrefix()
{
    return 'CountryType';
}

我想做的是根据实体的实例修改 selectedCountryId 参数：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(
        FormEvents::PRE_SET_DATA, array($this, 'onPreSetData')
    );
}


public function onPreSetData(FormEvent $event)
{
    if ($event->getData() instanceof Country) {
        $this->selectedCountryId = $event->getData()->getId();
    }
}

但是在这个阶段已经调用了setOptions，我不知道如何在这里修改查询生成器。一般来说，我想要实现的是允许下拉列表中的给定国家，如果它已经针对给定实体存储（并在稍后停用）。

Answer 1

在这种情况下，您仍有机会在 PRE_SET_DATA 事件中修改查询构建器，因为选择列表在创建表单视图之前不会构建。

这应该可以解决问题：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
        if (null !== $country = $event->getData()) {
            // at this point the option is already resolved 
            // so it'll return the QueryBuilder instance
            $qb = $event->getForm()->getConfig()->getOption('query_builder');
            $qb->orWhere('c = :country')->setParameter('country', $country);
        }
    });
}

public function configureOptions(OptionsResolver $resolver)
{
    $resolver->setDefaults([
        'class' => Country::class,
        'query_builder' => function (CountryRepository $r) {
            return $r->createQueryBuilder('c')
                ->where('c.active = 1')
                ->orderBy('c.ord', 'ASC')
                ->addOrderBy('c.name', 'ASC')
            ;
        },
    ]);
}

它只适用于对象的实例。

在表单侦听器中修改查询构建器

Modify query builder in a Form listener

php

symfony

symfony-3.4