Define Custom Form Type for Fields

Extended fields are rendered as HTML controls, and control type (text, textarea, number, checkbox, etc.) is defined by classes that implement Symfony\Component\Form\FormTypeGuesserInterface.

In case of extended fields, OroPlatform has three guessers (in decreasing priority): FormConfigGuesser, ExtendFieldTypeGuesser and DoctrineTypeGuesser.

Each provides guesses, and the best guess is selected based on the guesser’s confidence (low, medium, high, very high).

There are a few ways to define a custom form type and form options for a particular extended field:

Through the compiler pass to add or override the guesser’s mappings:

src/Acme/Bundle/DemoBundle/DependencyInjection/Compiler/AcmeExtendGuesserPass.php

namespace Acme\Bundle\DemoBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Form\Extension\Core\Type\TimeType;

class AcmeExtendGuesserPass implements CompilerPassInterface
{
    /**
     * @inheritDoc
     */
    public function process(ContainerBuilder $container)
    {
        $guesser = $container->findDefinition('oro_entity_extend.provider.extend_field_form_type');
        $guesser->addMethodCall(
            'addExtendTypeMapping',
            ['time', TimeType::class, ['model_timezone' => "UTC", 'view_timezone' => "UTC"]]
        );
    }
}

With a custom form extend field options provider that can be used for providing form options that need a complex logic and cannot be declared in compiler pass:

src/Acme/Bundle/DemoBundle/Provider/ExtendFieldCustomFormOptionsProvider.php

namespace Acme\Bundle\DemoBundle\Provider;

use Oro\Bundle\EntityExtendBundle\Provider\ExtendFieldFormOptionsProviderInterface;

class ExtendFieldCustomFormOptionsProvider implements ExtendFieldFormOptionsProviderInterface
{
    /**
     * @inheritDoc
     */
    public function getOptions(string $className, string $fieldName): array
    {
        $options = [];
        if ($className === '...' && $fieldName === '...') {
            $options['custom_option'] = 'custom_value';
        }

        return $options;
    }
}

Register it in the dependency injection container:

services:
    acme.provider.extend_field_form_options:
      class: Acme\Bundle\DemoBundle\Provider\ExtendFieldCustomFormOptionsProvider
      tags:
        - { name: acme_entity_extend.form_options_provider }

With a custom guesser that will have higher priority or will provide a guess with the highest confidence value:

src/Acme/Bundle/DemoBundle/Form/Guesser/CustomTypeGuesser.php

namespace Acme\Bundle\DemoBundle\Form\Guesser;

use Symfony\Component\Form\FormTypeGuesserInterface;
use Symfony\Component\Form\Guess\TypeGuess;
use Symfony\Component\Form\Guess\ValueGuess;

class CustomTypeGuesser implements FormTypeGuesserInterface
{
    /**
     * @inheritDoc
     */
    public function guessType(string $class, string $property)
    {
        // some conditions here
        if ($class === '...' && $property === '') {
            $guessedType = '';
            $options     = [];
            return new TypeGuess($guessedType, $options, TypeGuess::HIGH_CONFIDENCE);
        }

        // not guessed
        return new ValueGuess(false, ValueGuess::LOW_CONFIDENCE);
    }

    /**
     * @inheritDoc
     */
    public function guessRequired(string $class, string $property)
    {
        return new ValueGuess(false, ValueGuess::LOW_CONFIDENCE);
    }

    /**
     * @inheritDoc
     */
    public function guessMaxLength(string $class, string $property)
    {
        return new ValueGuess(null, ValueGuess::LOW_CONFIDENCE);
    }

    /**
     * @inheritDoc
     */
    public function guessPattern(string $class, string $property)
    {
        return new ValueGuess(null, ValueGuess::LOW_CONFIDENCE);
    }
}

Register it in the dependency injection container:

acme.form.guesser.extend_field:
    class: Acme\Bundle\DemoBundle\Form\Guesser\CustomTypeGuesser
    tags:
        - { name: form.type_guesser, priority: N }

Here is an idea of what N should be, the existing guessers have the following priorities:

Guesser	Priority
FormConfigGuesser	20
ExtendFieldTypeGuesser	15
DoctrineTypeGuesser	10

Select it according to what you need to achieve.

Using attribute to a field or a related entity (if an extended field is an association)

#[Config(
    defaultValues: [
        ...
        'form' => [
            'form_type' => 'Oro\Bundle\UserBundle\Form\Type\UserSelectType',
            'form_option' => ['option1' => ..., ...]
        ]
    ]
)]