symfony2 Catchable Fatal Error: Object of class could not be converted to string

Question

I have this Entity defined:

Answer 1

For Symfony 3.x

According with Symfony docs v3.x you should use choice_label property to specify the entity field name to be used here.

->add('categoryDescription', 'collection',
        array(
            'type'         => new CategoriesDescriptionType(),
            'allow_add' => true,
            'options'      => array('data_class' => 'Apw\BlackbullBundle\Entity\CategoriesDescription'),
            'choice_label' => 'name',
            'by_reference' => false,

        ))