可捕获的致命错误：传递给AppBundle \\ Form \\ TagType :: __ construct（）的参数1必须是Doctrine \\ ORM \\ EntityRepository的实例，未给出任何实例，

Question

I am using EntityType field to create a multiple select dropdown. Also I want to query the available options based on user input (eg. standard ), and then display the options. For this, I am trying to inject EntityRepository into my TagType form itself, so that I can use it's CreateQueryBuilder . But I get this error -

Here is my code, TagType.php :

<?php

namespace AppBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Doctrine\ORM\EntityRepository;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;

class TagType extends AbstractType {

    protected $er;

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

    private function getTagsByCategoryName($categoryname, $er) {
        return $er->createQueryBuilder('t')
                ->innerJoin('t.categories', 'c', 'WITH', 'c.categoryname = :categoryname')
                ->setParameter('categoryname', $categoryname)
                ->orderBy('t.id', 'ASC');
    }

    public function buildForm(FormBuilderInterface $builder, array $options) {
        $builder->add('tagname', EntityType::class, array(
            'class' => 'AppBundle:Tag',
            'choices' => $this->getTagsByCategoryName('standard'),
            'choice_label' => 'tagname',
            'expanded' => false,
            'multiple' => true,
            'label' => 'Choose Tags',
        ));
    }

    public function configureOptions(OptionsResolver $resolver) {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\Tag',
            'tags' => null,
        ));
    }

}

Any ideas?

Answer 1

2 answers:

• You don't need to inject EntityRepository into your Form to use query_builder option of EntityType . EntityType will inject the EntityRepository on your behalf, you just need to define a method taking EntityRepository as parameter. Knowing this:

   class TagType extends AbstractType { private function getTagsByCategoryName($categoryname) { return function(EntityRepository $er) { return $er->createQueryBuilder('t') ->innerJoin('t.categories', 'c', 'WITH', 'c.categoryname = :categoryname') ->setParameter('categoryname', $categoryname) ->orderBy('t.id', 'ASC'); } } public function buildForm(FormBuilderInterface $builder, array $options) { $builder->add('tagname', EntityType::class, array( 'class' => 'AppBundle:Tag', 'choices' => $this->getTagsByCategoryName('standard'), 'choice_label' => 'tagname', 'expanded' => false, 'multiple' => true, 'label' => 'Choose Tags', )); } public function configureOptions(OptionsResolver $resolver) { $resolver->setDefaults(array( 'data_class' => 'AppBundle\\Entity\\Tag', 'tags' => null, )); } } 

should be enough.

• If you ever really need to inject a service inside your Form, use DependencyInjection .