Easyadmin CollectionType field is not saving the relationship oneToMany

If you're using EasyAdmin and the CollectionType field for a one-to-many relationship is not saving correctly, it might be due to some configuration issues or missing settings. Here are a few steps you can take to troubleshoot and resolve the problem:

1. Check the field configuration: Make sure that the field is correctly configured in your EasyAdmin configuration file (usually named easy_admin.yaml or easy_admin.yml). Ensure that you have defined the correct entity name and property for the one-to-many relationship.

Example configuration for a one-to-many relationship:

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easy_admin:
  entities:
    YourEntityName:
      class: App\Entity\YourEntityName
      fields:
        - { property: 'name', type: 'text' }
        - { property: 'relatedEntities', type: 'collection', type_options: { entry_type: 'App\Form\RelatedEntityType', by_reference: false } }

2. Check the by_reference option: In the configuration, ensure that the by_reference option is set to false. Setting by_reference to false is important for a one-to-many relationship to correctly handle the owning and inverse side of the association.

3. Verify the form type for the related entities: Make sure you have created the form type for the related entity (the many side of the relationship) and correctly handled the data persistence there.

Example form type for the related entity:

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// App\Form\RelatedEntityType.php

namespace App\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

class RelatedEntityType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('someField')
            // Add other fields as needed
        ;
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => 'App\Entity\RelatedEntity',
        ]);
    }
}

4. Check the owning and inverse side of the association: In your entities, ensure that the owning and inverse side of the one-to-many relationship is correctly set up. The OneToMany association should have mappedBy on the inverse side and inversedBy on the owning side.

For example:

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// App\Entity\YourEntityName.php

namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class YourEntityName
{
    // ...

    /**
     * @ORM\OneToMany(targetEntity="App\Entity\RelatedEntity", mappedBy="yourEntityName", cascade={"persist"})
     */
    private $relatedEntities;

    public function __construct()
    {
        $this->relatedEntities = new ArrayCollection();
    }

    // ...
}

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// App\Entity\RelatedEntity.php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class RelatedEntity
{
    // ...

    /**
     * @ORM\ManyToOne(targetEntity="App\Entity\YourEntityName", inversedBy="relatedEntities")
     * @ORM\JoinColumn(name="your_entity_name_id", referencedColumnName="id", onDelete="CASCADE")
     */
    private $yourEntityName;

    // ...
}

By following these steps, you should be able to set up the CollectionType field for a one-to-many relationship correctly, and it should save the relationship data properly when using EasyAdmin. If you're still experiencing issues, consider checking the Symfony and Doctrine logs for any error messages that might provide more insights into the problem.