将实体传递给FormType，以便可以在Symfony2的buildForm（）中运行其方法

Question

Started working with the Symfony framework and so far all has went well, but the following has me stumped.

I have need to pull previously persisted data to prepopulate some fields on another stage of a multi page form.

I had hoped to just pass in the object in order to use its methods but I can't seem to get it to work.

For example:

foo.php

...

$form = $this->formFactory->create('foo_type', $article);

...

fooType.php

...

protected $article;

    public function __construct(Article $article)
    {
        $this->article = $article;
    }

 public function buildForm(FormBuilderInterface $builder, array $options)
    {

        $builder
            ->add(
                'fooTitle',
                'text',
                array('data' => $this->article->getTitle())
            );
    }

...

forms.xml

    <service id="footType" class="\Path\To\File\fooType">
        <argument type="service" id="article" />
        <tag name="form.type" alias="foo_type" />
    </service>

I feel like I am missing out a crucial step somewhere but i'm struggling to understand how to relate the xml with the type class being used to build the form.

Answer 1

FormBuilder should NOT manipulate entity data, because as its name stands for, its role is to build the different fields of a Form .

About populating fields, it is actually pretty simple: if you set an attribute on your entity, when you bind your entity to your Form , the related field (ie the field with the same name as your attribute) will have its data changed adequately.

Example :

FooType.php

public function buildForm(FormBuilderInterface $builder, array $options)
{
    $builder
        ->add('title', 'text');
}

Foo.php

$article->setTitle('HELLO');
$this->formFactory->create('foo_type', $article);

Then, your FormView will directly have its title field filled with "HELLO" .