Building a form with dynamic widgets

I have 3 classes : Category, Parameter and Product.

• Category has a one-to-many relationship with Parameters.
• Product has a one-to-many relationship with Category.
• Parameters开发者_运维技巧 are attributes for a product (color, weight, size, brand, etc.).

When I select a category and create a new product I want to create a form with these parameters. How can I do this? Is it possible with symfony form framework? I hope for your help.

I trying do this something like:

 class ProductRepository extends EntityRepository
{

    public function getParameters()
    {
        $em = $this->getEntityManager();
        $parameters = $em->getRepository('ShopProductBundle:CatParameter')->findAll();
        $data = array();
        foreach ($parameters as $k => $value) {
            $name = $value->getId();
            $data[$name] = array("label" => $value->getName());
        }
        return $data;
    }

}

Form Class

class ProductType extends AbstractType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        $builder->add('name', 'text', array('label' => 'Name'));
        $data = $options['data'];
        foreach($data as $k => $item){
            $builder->add((string)$k, 'text', array('label' => $item['label']));
        }
    }

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

    public function getDefaultOptions(array $options){
        return array('data_class' => 'Shop\ProductBundle\Entity\Product');
    }
}

And create form in action:

$parameters = $em->getRepository('ShopProductBundle:Product')->getParameters();
$form = $this->createForm(new ProductType(), $parameters);

End have exception:

Expected argument of type "Shop\ProductBundle\Entity\Product", "array" given

I guess you're getting this exception because in your controller $parameters is not a product. You should build a new product, and add the parameters to it. Also please have a look to this article. It deals with a problem similar to yours.

As soon as you have setup data class in your form the only object you can get is it's type.

'data_class' => 'Shop\ProductBundle\Entity\Product'

The way I'm adding multiple parameters to a product entity is a collection of form items: How to add collection of items

Or maybe you just want to pass parameters like this:

$parameters = $em->getRepository('ShopProductBundle:Product')->getParameters();
$form = $this->createForm(new ProductType(), null, $parameters);

Or if you would like to have an entity:

$form = $this->createForm(new ProductType(), new Product(), $parameters);