phpformssymfonysymfony2

Symfony2 embedded forms + dynamic form update

I have a dropdown menu in my form and the form structure depends on its value. I have managed to solve the "form-update-issue" with event subscriber/listener class, where i am trying to update the main form according to dropdown's value.

The main problem is that i have to modify the form from values that persisted in the database. My DB schema:

I have 4 table: Model, ModelCategory, ModelCategoryKey, ModelParameter.

After the user choose a ModelCategory from the form's (form based on Model entity) dropdown i have to update the form with ModelParamater rows, but it's number and default values depends on ModelCategory 1--n ModelCategoryKey assocaiton.

I've tried to attach NEW ModelParameter entities to the main Model entity during the PRE_BIND event (also set their default values) and it seems working fine, but when i add the 'parameters' with a 'collection' typed element to the form i get the next error:

Entities passed to the choice field must be managed. Maybe persist them in the entity manager?

Clearly my entities can't be (and shouldn't be) persisted at this time.

All ideas are welcome!

UPDATE: Modifying the form after preSubmit/preBind:

$form->add('parameters','collection',array(
    'type' => new ModelParameterType(),         
));

OR

$form->add(
            $this->factory->createNamed('parameters','collection',null,
                array(
                    'type' => new ModelParameterType()
                    ))
        );

where the 'factory' attribute is a FormFactoryInterface. The error message is the same.

UPDATE2:

Further investigation proved, that if i don't add "default" entities to the assocation. Then it works without error.

Here is the source of my form modifying method:

public function preSubmit(FormEvent $event) {
    $form = $event->getForm();  
    $id = $event->getData()['modelCategory'];       
    $entity = $form->getData();
    $categoryKeys = $this->em->getRepository('MyBundle:ModelCategoryKey')->findByModelCategory(
        $this->em->getReference('MyBundle:modelCategory',$id)
    );      
    foreach ($categoryKeys as $key) {
        $param = new ModelParameter();
        $param->setModel($entity);
        $param->setKey($key); 
        $entity->addParameter($param);
    }

    $form->add(
        $this->factory->createNamed('parameters','collection',null,
            array(
                'type' => new ModelParameterType(),
                'allow_add' => true,
                'cascade_validation' => true
                ))
    );

}

SEEMS TO BE SOLVED BY I have just commented out the $param->setModel($entity); line and it seems to be working fine. I will work this out more and will share the experience, if it realy works.

Solution

  • I've managed to solve my problem, so here it is what i've found out: