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

Question

I have this Entity defined:

Answer 1

You can also use the property accessor into your form:

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

            ))

And add 'property' => 'name' in your CategoriesDescriptionType.

By the way the @CoachNono answer is ok too.