Symfony2 populate choice list from api data

Question

I have to populate a choice list from an Api call. I have try several approach without success.

I think the best way is by implementing ChoiceListInterface.

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Answer 1

Extend LazyChoiceList and implement loadChoiceList method, e.g

//ApiChoiceList.php
namespace Your\Namespace;
use Symfony\Component\Form\Extension\Core\ChoiceList\LazyChoiceList;
use Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceList;

class ApiChoiceList extends LazyChoiceList 
{
    protected function loadChoiceList()
    {
        //fetch and process api data

        return new ChoiceList($choices, $labels);

    }
}

And then in your buildForm method of your form,

$builder->add('fieldname', 'choice', array(
    'choice_list' => new Your\Namespace\ApiChoiceList(),
    //....
));