GraphqQl does not allow input embedded relation

[BernardA]

API Platform version(s) affected: "api-platform/api-pack": "^1.2",

Description
Fetching contacts from GooglePeopleApi and attempting to adding them to existing user.

Google provides an array of contacts.

I am following this comment from @dunglas #1645 (comment), and setting up a relation that share the same groups on the denormalization context for the operation updateUser.

I was expecting to be able to have the full Contact entity as an input to updateUser, but graphiql will only expect an array of strings, ie, contacts: [String] ( see screenshot below)

How to reproduce
( only relevant code )
The USER entity :

    *          "update"={
    *              "security"="(is_granted('IS_AUTHENTICATED_FULLY') and object == user) or is_granted('ROLE_ADMIN')",
    *              "denormalization_context"={
    *                  "groups"={"put-profile-change", "put-contacts", "put"}
    *              },
    *              "validation_groups"={"put-profile-change"}
    *          },

   .....

 /**
  * @ORM\OneToMany(targetEntity="App\Entity\Contact", mappedBy="user")
  * @Groups({"put", "put-contacts", "get-admin", "get-owner"})
  */
 private $contacts;

The CONTACT entity:

 *          "create"={
 *              "security"="is_granted('IS_AUTHENTICATED_FULLY')",
 *              "denormalization_context"={"groups"={"post", "put", "put-contacts"}},
 *              "normalization_context"={"groups"={"get-owner", "get-admin"}},
 *          },
 *          "update"={
 *              "security"="(is_granted('IS_AUTHENTICATED_FULLY') and object == user) or is_granted('ROLE_ADMIN')",
 *              "denormalization_context"={
 *                  "groups"={"put-contacts", "put"}
 *              },
 *          },

 ....


/**
 * @ORM\Id()
 * @ORM\GeneratedValue()
 * @ORM\Column(type="integer")
 * @Groups({"put", "put-contacts", "get-admin", "get-owner"})
 */
private $id;

/**
 * @ORM\ManyToOne(targetEntity="App\Entity\User", inversedBy="contacts")
 * @Groups({"post", "put", "put-contacts", "get-admin", "get-owner"})
 */
private $user;

/**
 * @ORM\Column(type="string", length=180)
 * @Groups({"post", "put", "put-contacts", "get-admin", "get-owner"})
 */
private $email;

Possible Solution

Additional Context
Update user input:

[alanpoulain]

Please see this comment: #3258 (comment).

Closing this issue in the meantime.