How to create/mutation entity with sub relation on apiplatform/graphql

Question

I want to create two entities that are related. How can I create the first entity with the required sub-entity.

I've tried the following code but graphql returns the following error:

{
  "errors": [
    {
      "message": "Variable \"$stock\" of type \"createProductInput!\" used in position expecting type \"String\".",
      "extensions": {
        "category": "graphql"
      },
      "locations": [
        {
          "line": 7,
          "column": 3
        },
        {
          "line": 15,
          "column": 17
        }
      ]
    }
  ]
}

The mutation:

mutation createProduct ($input: createProductInput!) {
  createProduct(input: $input) {
    clientMutationId

    product {
      uuid
      name
      sku
    }
  }
}

the variables:

{
  "input": {
    "name": "ProductAAA",
    "sku": "product_aaa",
    "stock": {
      "quantity": 33,
      "unit": "s"
    }
  }
}

Oddly the createProductInput says that stock is a string instead of an object.

uuid: String!
name: String!
sku: String!
stock: String
clientMutationId: String

These are my entities:

// Product.php

use ApiPlatform\Core\Annotation\ApiFilter;
use ApiPlatform\Core\Annotation\ApiProperty;
use ApiPlatform\Core\Annotation\ApiResource;
use ApiPlatform\Core\Annotation\ApiSubresource;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ApiResource
 * @ApiFilter(ApiPlatform\Core\Bridge\Doctrine\Orm\Filter\SearchFilter::class, properties={"name": "partial", "sku": "partial"})
 *
 * @ORM\Table(name="products")
 */
class Product
{
    /**
     * @ORM\Id
     * @ORM\Column(name="product_id", type="uuid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator")
     *
     * @ApiProperty(identifier=true)
     */
    private $id;

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

    /**
     * @ORM\Column(type="string")
     */
    private $sku;

    /**
     * @ORM\ManyToOne(targetEntity="Stock", cascade={"PERSIST"})
     * @ORM\JoinColumn(name="stock_id", referencedColumnName="stock_id")
     *
     * @ApiSubresource
     */
    private $stock;
}

// Stock.php

use ApiPlatform\Core\Annotation\ApiProperty;
use ApiPlatform\Core\Annotation\ApiResource;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ApiResource
 *
 * @ORM\Table(name="stocks")
 */
class Stock
{
    /**
     * @ORM\Id
     * @ORM\Column(name="stock_id", type="uuid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator")
     *
     * @ApiProperty(identifier=true)
     */
    private $id;

    /**
     * @ORM\Column(type="string")
     */
    private $quantity;

    /**
     * @ORM\Column(type="string")
     */
    private $unit;
}

Answer 1

You cannot create a nested entity in a mutation, you need to create the nested entity first then use its IRI in the mutation. That's why the type is String .

It was possible before but has been removed because it was causing some issues. See: https://github.com/api-platform/core/pull/1886

Answer 2

following your question I created the first entity through its own mutation. Then when I want to use it in the second one, nothing happen. My Cart Item is persisted without any Poster linked to it. I don't understand why. Here are my codes :

/**
 * @ApiResource()
 * @ORM\Entity(repositoryClass="App\Repository\CartRepository")
 */
class Cart
{
    /**
     * @ApiSubresource
     * @ORM\OneToMany(targetEntity="Poster", mappedBy="cart")
     */
    private $posters;
}

GraphQL mutation:

mutation AddCart(
    $posters: [String]!
  ) {
    createCart(input: {
      posters: $posters
    }) {
      cart {
        id,
        posters {
          edges {
            node {
              id
            }
          }
        }
      }
    }
  }

Variables:

{
  "posters": [
    "/api/posters/4733d25c-c37b-4162-b25b-fabb3e58177e"
  ]
}

I obviously did a mistake somewhere :) Do you think you can help me? Thanks a lot!

Answer 3

mutation CreateUser{
  createUser(input: {
    email: "user@test.com", 
    username: "user@test.com", 
    role: "ROLE_USER",
    password: "bonjour",
    enabled: true,
  }) {
    user{
        id
      email
      username
      role
      reference
      enabled
      created
      updated
    }
  }
}