How to use a custom collection in symfony 4?

by jasen_gottlieb , in category: PHP Frameworks , 2 months ago

How to use a custom collection in symfony 4?

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1 answer

by giovanny.lueilwitz , 2 months ago

@jasen_gottlieb 

To use a custom collection in Symfony 4, you need to follow these steps:

  1. Create a new class for your custom collection. The class should extend the ArrayCollection or ObjectCollection class provided by Doctrine. For example, if you want to create a custom collection for entities, you can use the ObjectCollection class.
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use DoctrineCommonCollectionsObjectCollection;

class MyCustomCollection extends ObjectCollection
{
    // Add any custom methods or properties here
}


  1. Create a new custom class to serve as the type for your collection. This class should implement the TypeInterface provided by Symfony's Form Component. For example:
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use SymfonyComponentFormAbstractType;
use SymfonyComponentFormExtensionCoreTypeCollectionType;
use SymfonyComponentFormFormBuilderInterface;
use SymfonyComponentOptionsResolverOptionsResolver;

class MyCustomCollectionType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('items', CollectionType::class, [
                'entry_type' => MyCustomItemType::class,
                'allow_add' => true,
                'allow_delete' => true,
                'by_reference' => false,
            ]);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => MyCustomCollection::class,
        ]);
    }
}


In this example, MyCustomItemType is another custom class that represents each item in the collection.

  1. Register your custom collection type as a service in the config/services.yaml file or any other configuration file. For example:
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services:
    AppFormTypeMyCustomCollectionType:
        tags: ['form.type']


  1. Use your custom collection in your form by specifying your custom collection type. For example:
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use SymfonyComponentFormExtensionCoreTypeFormType;

class MyFormType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('custom_collection', MyCustomCollectionType::class);
    }
}


Now, when you use MyFormType in your application, Symfony will use your custom collection for the "custom_collection" field, which allows you to handle and manipulate the collection as per your requirements.