[BUG 2.4.4] Inheritance abstract class

[baudev]

The regression appeared in version 2.4.4. Indeed, the code below is fully functional with version 2.4.3. I've discussed with @teohhanhui on Slack about this issue.

On the image, we can see the inheritance relationship between the different objects. Teachr and Client inherit from User which is an abstract class (codes are below).
There is a relationship between the User and Address objects.

User:

/**
 * The User class.
 *
 * @ORM\Entity()
 * @ORM\Table()
 * @InheritanceType("SINGLE_TABLE")
 * @DiscriminatorColumn(name="discr", type="string")
 * @DiscriminatorMap({"user" = "User", "client" = "Client", "teachr" = "Teachr"})
 */
abstract class User implements UserInterface
{

   /** ... */

    /**
     * @ORM\OneToMany(targetEntity="App\Entity\Address", cascade={"persist", "remove"}, mappedBy="owner")
     * @Groups({"read_client", "read_teachr"})
     */
    private $addresses;

}

Client (same for Teachr):

/**
 * Class for Clients.
 *
 * @ApiResource()
 * @ORM\Entity()
 */
class Client extends User
{

}

Address:

/**
 * Class Address.
 *
 * @ApiResource()
 * @ORM\Entity()
 */
class Address
{

    /** ... */

    /**
     * @var User Client or Teach'r address owner.
     *
     * @ORM\ManyToOne(targetEntity="App\Entity\User", inversedBy="addresses")
     * @Groups({"read_address", "write_address"})
     */
    private $owner;

}

---

The error:

{
  "@context": "/contexts/Error",
  "@type": "hydra:Error",
  "hydra:title": "An error occurred",
  "hydra:description": "Cannot instantiate abstract class App\\Entity\\User",
  "trace": [
    {
      "namespace": "",
      "short_class": "",
      "class": "",
      "type": "",
      "function": "",
      "file": "/var/www/html/vendor/symfony/serializer/Normalizer/AbstractNormalizer.php",
      "line": 452,
      "args": []
    },
    {
      "namespace": "",
      "short_class": "ReflectionClass",
      "class": "ReflectionClass",
      "type": "->",
      "function": "newInstanceArgs",
      "file": "/var/www/html/vendor/symfony/serializer/Normalizer/AbstractNormalizer.php",
      "line": 452,
      "args": [
        [
          "array",
          []
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer\\Normalizer",
      "short_class": "AbstractNormalizer",
      "class": "Symfony\\Component\\Serializer\\Normalizer\\AbstractNormalizer",
      "type": "->",
      "function": "instantiateObject",
      "file": "/var/www/html/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php",
      "line": 182,
      "args": [
        [
          "array",
          [
            [
              "string",
              "/clients/1"
            ]
          ]
        ],
        [
          "string",
          "App\\Entity\\User"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ],
        [
          "object",
          "ReflectionClass"
        ],
        [
          "array",
          []
        ],
        [
          "string",
          "jsonld"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer\\Normalizer",
      "short_class": "AbstractObjectNormalizer",
      "class": "Symfony\\Component\\Serializer\\Normalizer\\AbstractObjectNormalizer",
      "type": "->",
      "function": "instantiateObject",
      "file": "/var/www/html/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php",
      "line": 283,
      "args": [
        [
          "array",
          [
            [
              "string",
              "/clients/1"
            ]
          ]
        ],
        [
          "string",
          "App\\Entity\\User"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ],
        [
          "object",
          "ReflectionClass"
        ],
        [
          "array",
          []
        ],
        [
          "string",
          "jsonld"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer\\Normalizer",
      "short_class": "AbstractObjectNormalizer",
      "class": "Symfony\\Component\\Serializer\\Normalizer\\AbstractObjectNormalizer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/symfony/serializer/Serializer.php",
      "line": 191,
      "args": [
        [
          "string",
          "/clients/1"
        ],
        [
          "string",
          "App\\Entity\\User"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer",
      "short_class": "Serializer",
      "class": "Symfony\\Component\\Serializer\\Serializer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/api-platform/core/src/Serializer/AbstractItemNormalizer.php",
      "line": 690,
      "args": [
        [
          "string",
          "/clients/1"
        ],
        [
          "string",
          "App\\Entity\\User"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "ApiPlatform\\Core\\Serializer",
      "short_class": "AbstractItemNormalizer",
      "class": "ApiPlatform\\Core\\Serializer\\AbstractItemNormalizer",
      "type": "->",
      "function": "createAttributeValue",
      "file": "/var/www/html/vendor/api-platform/core/src/Serializer/AbstractItemNormalizer.php",
      "line": 350,
      "args": [
        [
          "string",
          "owner"
        ],
        [
          "string",
          "/clients/1"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "ApiPlatform\\Core\\Serializer",
      "short_class": "AbstractItemNormalizer",
      "class": "ApiPlatform\\Core\\Serializer\\AbstractItemNormalizer",
      "type": "->",
      "function": "setAttributeValue",
      "file": "/var/www/html/vendor/symfony/serializer/Normalizer/AbstractObjectNormalizer.php",
      "line": 300,
      "args": [
        [
          "object",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "owner"
        ],
        [
          "string",
          "/clients/1"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "resource_class": [
              "string",
              "App\\Entity\\Address"
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ],
            "cache_key": [
              "string",
              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer\\Normalizer",
      "short_class": "AbstractObjectNormalizer",
      "class": "Symfony\\Component\\Serializer\\Normalizer\\AbstractObjectNormalizer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/api-platform/core/src/Serializer/AbstractItemNormalizer.php",
      "line": 219,
      "args": [
        [
          "array",
          {
            "googlePlaceId": [
              "string",
              "string"
            ],
            "sessionToken": [
              "string",
              "string"
            ],
            "houseCode": [
              "string",
              "string"
            ],
            "extraInformation": [
              "string",
              "string"
            ],
            "owner": [
              "string",
              "/clients/1"
            ]
          }
        ],
        [
          "string",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "resource_class": [
              "string",
              "App\\Entity\\Address"
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
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            ],
            "cache_key": [
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              "2d51165683a23cc89b05ec2cfbca3ff3"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "ApiPlatform\\Core\\Serializer",
      "short_class": "AbstractItemNormalizer",
      "class": "ApiPlatform\\Core\\Serializer\\AbstractItemNormalizer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/api-platform/core/src/JsonLd/Serializer/ItemNormalizer.php",
      "line": 117,
      "args": [
        [
          "array",
          {
            "googlePlaceId": [
              "string",
              "string"
            ],
            "sessionToken": [
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            ],
            "houseCode": [
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            ],
            "extraInformation": [
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              "string"
            ],
            "owner": [
              "string",
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            ]
          }
        ],
        [
          "string",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
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            ],
            "resource_class": [
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            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ],
            "api_denormalize": [
              "boolean",
              true
            ]
          }
        ]
      ]
    },
    {
      "namespace": "ApiPlatform\\Core\\JsonLd\\Serializer",
      "short_class": "ItemNormalizer",
      "class": "ApiPlatform\\Core\\JsonLd\\Serializer\\ItemNormalizer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/symfony/serializer/Serializer.php",
      "line": 191,
      "args": [
        [
          "array",
          {
            "googlePlaceId": [
              "string",
              "string"
            ],
            "sessionToken": [
              "string",
              "string"
            ],
            "houseCode": [
              "string",
              "string"
            ],
            "extraInformation": [
              "string",
              "string"
            ],
            "owner": [
              "string",
              "/clients/1"
            ]
          }
        ],
        [
          "string",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "resource_class": [
              "string",
              "App\\Entity\\Address"
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
              "string",
              "http://localhost:8082/addresses"
            ]
          }
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer",
      "short_class": "Serializer",
      "class": "Symfony\\Component\\Serializer\\Serializer",
      "type": "->",
      "function": "denormalize",
      "file": "/var/www/html/vendor/symfony/serializer/Serializer.php",
      "line": 142,
      "args": [
        [
          "array",
          {
            "googlePlaceId": [
              "string",
              "string"
            ],
            "sessionToken": [
              "string",
              "string"
            ],
            "houseCode": [
              "string",
              "string"
            ],
            "extraInformation": [
              "string",
              "string"
            ],
            "owner": [
              "string",
              "/clients/1"
            ]
          }
        ],
        [
          "string",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
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              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
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            ],
            "collection_operation_name": [
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            ],
            "api_allow_update": [
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            ],
            "resource_class": [
              "string",
              "App\\Entity\\Address"
            ],
            "input": [
              "null",
              null
            ],
            "output": [
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              null
            ],
            "request_uri": [
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            "uri": [
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            ]
          }
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\Serializer",
      "short_class": "Serializer",
      "class": "Symfony\\Component\\Serializer\\Serializer",
      "type": "->",
      "function": "deserialize",
      "file": "/var/www/html/vendor/api-platform/core/src/EventListener/DeserializeListener.php",
      "line": 100,
      "args": [
        [
          "array",
          {
            "googlePlaceId": [
              "string",
              "string"
            ],
            "sessionToken": [
              "string",
              "string"
            ],
            "houseCode": [
              "string",
              "string"
            ],
            "extraInformation": [
              "string",
              "string"
            ],
            "owner": [
              "string",
              "/clients/1"
            ]
          }
        ],
        [
          "string",
          "App\\Entity\\Address"
        ],
        [
          "string",
          "jsonld"
        ],
        [
          "array",
          {
            "groups": [
              "array",
              [
                [
                  "string",
                  "write_address"
                ]
              ]
            ],
            "operation_type": [
              "string",
              "collection"
            ],
            "collection_operation_name": [
              "string",
              "post"
            ],
            "api_allow_update": [
              "boolean",
              false
            ],
            "resource_class": [
              "string",
              "App\\Entity\\Address"
            ],
            "input": [
              "null",
              null
            ],
            "output": [
              "null",
              null
            ],
            "request_uri": [
              "string",
              "/addresses"
            ],
            "uri": [
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            ]
          }
        ]
      ]
    },
    {
      "namespace": "ApiPlatform\\Core\\EventListener",
      "short_class": "DeserializeListener",
      "class": "ApiPlatform\\Core\\EventListener\\DeserializeListener",
      "type": "->",
      "function": "onKernelRequest",
      "file": "/var/www/html/vendor/symfony/event-dispatcher/Debug/WrappedListener.php",
      "line": 115,
      "args": [
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        [
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        ]
      ]
    },
    {
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      "short_class": "WrappedListener",
      "class": "Symfony\\Component\\EventDispatcher\\Debug\\WrappedListener",
      "type": "->",
      "function": "__invoke",
      "file": "/var/www/html/vendor/symfony/event-dispatcher/EventDispatcher.php",
      "line": 212,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Event\\GetResponseEvent"
        ],
        [
          "string",
          "kernel.request"
        ],
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Debug\\TraceableEventDispatcher"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\EventDispatcher",
      "short_class": "EventDispatcher",
      "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
      "type": "->",
      "function": "doDispatch",
      "file": "/var/www/html/vendor/symfony/event-dispatcher/EventDispatcher.php",
      "line": 44,
      "args": [
        [
          "array",
          [
            [
              "object",
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            ]
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        [
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        ]
      ]
    },
    {
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      "short_class": "EventDispatcher",
      "class": "Symfony\\Component\\EventDispatcher\\EventDispatcher",
      "type": "->",
      "function": "dispatch",
      "file": "/var/www/html/vendor/symfony/event-dispatcher/Debug/TraceableEventDispatcher.php",
      "line": 145,
      "args": [
        [
          "string",
          "kernel.request"
        ],
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Event\\GetResponseEvent"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\EventDispatcher\\Debug",
      "short_class": "TraceableEventDispatcher",
      "class": "Symfony\\Component\\EventDispatcher\\Debug\\TraceableEventDispatcher",
      "type": "->",
      "function": "dispatch",
      "file": "/var/www/html/vendor/symfony/http-kernel/HttpKernel.php",
      "line": 126,
      "args": [
        [
          "string",
          "kernel.request"
        ],
        [
          "object",
          "Symfony\\Component\\HttpKernel\\Event\\GetResponseEvent"
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "HttpKernel",
      "class": "Symfony\\Component\\HttpKernel\\HttpKernel",
      "type": "->",
      "function": "handleRaw",
      "file": "/var/www/html/vendor/symfony/http-kernel/HttpKernel.php",
      "line": 67,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ],
        [
          "integer",
          1
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "HttpKernel",
      "class": "Symfony\\Component\\HttpKernel\\HttpKernel",
      "type": "->",
      "function": "handle",
      "file": "/var/www/html/vendor/symfony/http-kernel/Kernel.php",
      "line": 198,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ],
        [
          "integer",
          1
        ],
        [
          "boolean",
          true
        ]
      ]
    },
    {
      "namespace": "Symfony\\Component\\HttpKernel",
      "short_class": "Kernel",
      "class": "Symfony\\Component\\HttpKernel\\Kernel",
      "type": "->",
      "function": "handle",
      "file": "/var/www/html/public/index.php",
      "line": 25,
      "args": [
        [
          "object",
          "Symfony\\Component\\HttpFoundation\\Request"
        ]
      ]
    }
  ]
}

By the way, thank you for this wonderful framework ❤️

[jmwri]

I believe this may be a duplicate of #2931?

[baudev]

It seems that the normalisation process will only use the properties defined the the parent class if you use inheritance within entities.

In your issue you seem to mention only the missing attributes of the daughter classes whereas in my case it is an impossibility to use Doctrine Relations with an abstract class.

[teohhanhui]

Hi @baudev, as we've discussed on Slack, have you checked this out?

https://symfony.com/doc/current/components/serializer.html#serializing-interfaces-and-abstract-classes

(The annotation has the same name as Doctrine's DiscriminatorMap, but they're of course not the same.)

[eekes]

Hi @teohhanhui, not sure if I should post it here, but since the issue was still open ... 🙂

I'm also getting Cannot instantiate abstract class App\Entity\User today since updating from 2.4.3:

This is the (simplified) scheme:

<entity name="App\Entity\User" inheritance-type="JOINED">
    <discriminator-column name="type" type="string"/>
    <discriminator-map>
        <discriminator-mapping value="type_a" class="App\Entity\UserTypeA"/>
        <discriminator-mapping value="type_b" class="App\Entity\UserTypeB"/>
        <discriminator-mapping value="type_c" class="App\Entity\UserTypeC"/>
    </discriminator-map>

    <one-to-many field="documents" target-entity="App\Entity\Document" mapped-by="user" orphan-removal="true"/>
</entity>

<entity name="App\Entity\Document">
    <many-to-one field="user" target-entity="App\Entity\User" inversed-by="documents"/>
</entity>

Is there anything I should be doing differently starting from 2.4.4?

[eekes]

Hello @baudev, did you ever find a way to fix this? 🙂

[baudev]

@eekes, unfortunately I haven't really looked yet. I have many other bugs in parallel.
The temporary solution I found (not optimal) is to stay on version 2.4.3.

[mbrodala]

We see the same issue but interestingly only in API tests. It works just fine in the browser with real requests ... 🤔

[mbrodala]

@teohhanhui Unfortunately one cannot add the Serializer DiscriminatorMap annotation/attribute just like that since Symfony will then (rightfully) complain about the missing typeProperty:

Type property "type" not found for the abstract object "App\\Entity\\AbstractEntity"

This makes sense since the property is managed by Doctrine using the DiscriminatorColumn annotation/attribute. It does not exist "physically" on the entity.

Attempt to add it:

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

Next error:

[Symfony\Component\Config\Exception\LoaderLoadException] Duplicate definition of column 'type' on entity 'App\Entity\AbstractEntity' in a field or discriminator column mapping in . (which is being imported from "/var/www/html/config/routes/api_platform.yaml"). Make sure there is a loader supporting the "api_platform" type.

Any ideas?