Class does not implement “Symfony\Component\Form\FormTypeInterface” in Sylius

问题

We are trying to extend from CustomerProfileType and we are getting error like:

 {
"code": 500,
"message": "Could not load type "abc\Form\Extension\AdminApi\CustomerProfileTypeExtension": class does not implement "Symfony\Component\Form\FormTypeInterface"."
}

Customer.yml:

sylius_admin_api_customer_create:
    path: /
    methods: [POST]
    defaults:
        _controller: sylius.controller.customer:createAction
        _sylius:
            serialization_version: $version
            serialization_groups: [Detailed]
            form:
                type: abc\Form\Extension\AdminApi\CustomerProfileTypeExtension

CustomerProfileTypeExtension.php

final class CustomerProfileTypeExtension extends AbstractTypeExtension
{
    /**
     * {@inheritdoc}
     */
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        // Adding new fields works just like in the parent form type.
        $builder->add('contactHours', TextType::class, [
            'required' => false,
            'label' => 'app.form.customer.contact_hours',
        ]);

        // To remove a field from a form simply call ->remove(`fieldName`).
        $builder->remove('gender');

        // You can change the label by adding again the same field with a changed `label` parameter.
        $builder->add('lastName', TextType::class, [
            'label' => 'app.form.customer.surname',
        ]);
    }


    /**
     * {@inheritdoc}
     */
    public function getExtendedType(): string
    {
        return CustomerProfileType::class;
    }


}

回答1:

As the exception message suggests, you are implementing a form type extension instead of a form type.

Form type extensions are intended to modify the way forms function:

They have 2 main use-cases:

You want to add a specific feature to a single form type (such as adding a "download" feature to the FileType field type);

You want to add a generic feature to several types (such as adding a "help" text to every "input text"-like type).

To implement specific forms, you should either implement the Symfony\Component\Form\FormTypeInterface or extend a class that implements it (commonly in Symfony that would be Symfony\Component\Form\AbstractType).

To use inheritance in form types, use FormInterface#getParent. This SO question might help you with that.

来源：https://stackoverflow.com/questions/51036516/class-does-not-implement-symfony-component-form-formtypeinterface-in-sylius

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symfony

sylius