Nested form symfony 3

Question

I have 2 entity in my symfony application with ManyToOne Relationship

class Sprint
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;...

And

Class Livrable
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

    /**
     * @ORM\ManyToOne(targetEntity="App\MemberBundle\Entity\Sprint", cascade={"persist"})
     * @ORM\JoinColumn(nullable=true)
     */
    private $sprint; ....

And in my form LivrableType, I have

   public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder->add('name')
                ->add('sprint', SprintType::class);
    }

Everything goes well when I create a Livrable with a sprint but, what I need is to allow the user to either choose his sprint if existing and create it if not existing. Thanks you for your help

Answer 1

Instead of mapping form directly to entity, make some kind of DTO (LivrableDTO), which will have Sprint, SprintSelect and SprintCreate properties. This DTO you can map back to your Livrable entity.