Inherit form or add type to each form

Question

I am searching for an easy way to add a bundle of fields to each form.

I have found a way to extend the AbstractType and use the buildForm method to add more fields.
When creating the form I give the name of my new type (How to Create a Custom Form Field Type).

In my opinion it is an easy way, but it is restricted to one type per form.

Is there a better way to achieve anything like that?
I have read the cookbook of symfony, but I have only found stuff how to extend an existing form not how to create an own form "template" with my fields.

Answer 1

Have you tried using inheritance?

This is really simple, first you have to define a form type:

# file: Your\Bundle\Form\BaseType.php
<?php

namespace Your\Bundle\Form\Type;

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

class BaseType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name', 'text');

        $builder->add('add', 'submit');
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Your\Bundle\Entity\YourEntity',
        ));
    }

    public function getName()
    {
        return 'base';
    }
}

Then you can extend this form type:

# file: Your\Bundle\Form\ExtendType.php
<?php

namespace Your\Bundle\Form\Type;

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

class ExtendType extends BaseType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        parent::buildForm($builder, $options);

        # you can also remove an element from the parent form type
        # $builder->remove('some_field');

        $builder->add('number', 'integer');
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'Your\Bundle\Entity\YourEntity',
        ));
    }

    public function getName()
    {
        return 'extend';
    }
}

The BaseType will display a name field and an add submit button. The ExtendType will display a name field, an add submit button and a number field.