Passing data to buildForm() in Symfony 2.8, 3.0 and above

Question

My application currently passes data to my form type using the constructor, as recommended in this answer. However the Symfony 2.8 upgrade guide advises that passing a type

Answer 1

Here can be used another approach - inject service for retrieve data.

1. Describe your form as service (cookbook)
2. Add protected field and constructor to form class
3. Use injected object for get any data you need

Example:

services:
    app.any.manager:
        class: AppBundle\Service\AnyManager

    form.my.type:
        class: AppBundle\Form\MyType
        arguments: ["@app.any.manager"]
        tags: [ name: form.type ]

---

manager = $manager;
    }

    public function buildForm(FormBuilderInterface $builder, array $options) {
        $choices = $this->manager->getSomeData();

        $builder
            ->add('type', ChoiceType::class, [
                'choices' => $choices
            ])
        ;
    }

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

}