LinksHandlerTrait : The class "App\Entity\EntityName" cannot be retrieved from "App\Entity\EntityName"

[xterr]

API Platform version(s) affected: 3.2.7

Description
RuntimeException is thrown on line 87 in LinksHandlerTrait for:

1. Entity with a column of type enum
2. Int BackedEnum, with a member with value = 0

• The issue is present only when there is a value equal to 0 in the database.
• The issue happens for single items and collections.
• For non-enum fields value=0 is accepted and all functionality is as expected.

How to reproduce

enum StateEnum: int {
  case NEW      = 0;
  case ACTIVE   = 1;
  case INACTIVE = 2;
}

#[ORM\Entity]
#[ApiResource]
class Entity {
  #[ORM\Column(type: Types::SMALLINT, enumType: StateEnum::class)]
  #[Groups(['entity:read', 'entity:write'])]
  #[Assert\Choice(callback: [StateEnum::class, 'cases'])]
  state: StateEnum
}

Additional context
After some debugging, I observed that the data was correctly retrieved from the database.
The problem might start from ApiPlatform\GraphQl\State\Provider\ReadProvider#107
ReadProvider

[soyuka]

Are you using the enum as identifier? this isn't supported may we see the whole resource or some more informations as this is not enough?

[xterr]

@soyuka no. The entity has id autoincrement as the identifier.

Only normal fields typed with enum (like in the example) have this problem. (I also have setters and getters defined as i know it impacts propertyResolver)

It seems to occur only for graphql endpoint.

I also did more tests by changing the column name from state to type and other non-common names), same problem.

Thank you 👍

[soyuka]

I see, can you provide a reproducer ?

[xterr]

I created a repository for this purpose:
https://github.com/xterr/api-platform-links-handler-trait

You can find a test case in the readme

Thank you

[GwendolenLynch]

This looks to be fixed by #6092

The tl;dr of what was happening was right here

core/src/GraphQl/Resolver/Factory/ResolverFactory.php

Line 41 in 875cc15

if ($body || null === $resourceClass || ($type && !$type->isCollection())) {

$body was equal to 0 so the loose comparison sent things down the wrong code path.