Simulate Association and Reuse Admin code

gistfile1.aw

<?php

        // simulate an association ...
        $fieldDescription = $formMapper->getAdmin()->getModelManager()->getNewFieldDescriptionInstance($this->mediaAdmin->getClass(), 'media' );
        $fieldDescription->setAssociationAdmin($this->getMediaAdmin());
        $fieldDescription->setAdmin($formMapper->getAdmin());
        $fieldDescription->setOption('edit', 'list');
        $fieldDescription->setAssociationMapping(array('fieldName' => 'media', 'type' => \Doctrine\ORM\Mapping\ClassMetadataInfo::MANY_TO_ONE));

        // create the builder
        $builder = $formMapper->create('mediaId', 'sonata_type_model', array(
            'sonata_field_description' => $fieldDescription,
            'class'             => $this->getMediaAdmin()->getClass(),
            'model_manager'     => $this->getMediaAdmin()->getModelManager()
        ));

        // use the builder
        $formMapper->add('settings', 'sonata_type_immutable_array', array(
            'keys' => array(
                array('title', 'text', array('required' => false)),
                array('context', 'choice', array('required' => true, 'choices' => $contextChoices)),
                array('format', 'choice', array('required' => count($formatChoices) > 0, 'choices' => $formatChoices)),
                array($builder, null, array()),
            )
        ));