After enabling options.EnableResourceHooks = true; I get a NullReference on GET Articles/GetSecondary [id/relationshipName]

[woofi7]

DESCRIPTION

The request is crashing on this line because the type is IIdentifiable instead of the implemented type Image.
https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/src/JsonApiDotNetCore/Configuration/ResourceGraph.cs#L85

The implementation seems to be lost at this place:
https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/src/JsonApiDotNetCore/Hooks/Internal/ResourceHookExecutorFacade.cs#L131

System.NullReferenceException: Object reference not set to an instance of an object.
  at JsonApiDotNetCore.Configuration.ResourceGraph.GetRelationships
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Configuration\ResourceGraph.cs:85
  at JsonApiDotNetCore.Hooks.Internal.Traversal.TraversalHelper.RegisterRelationshipProxies
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Hooks\Internal\Traversal\TraversalHelper.cs:200
  at JsonApiDotNetCore.Hooks.Internal.Traversal.TraversalHelper.CreateRootNode
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Hooks\Internal\Traversal\TraversalHelper.cs:56
  at JsonApiDotNetCore.Hooks.Internal.ResourceHookExecutor.GetHook
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Hooks\Internal\ResourceHookExecutor.cs:199
  at JsonApiDotNetCore.Hooks.Internal.ResourceHookExecutor.OnReturn
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Hooks\Internal\ResourceHookExecutor.cs:121
  at JsonApiDotNetCore.Hooks.Internal.ResourceHookExecutorFacade.OnReturnRelationship
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Hooks\Internal\ResourceHookExecutorFacade.cs:131
  at JsonApiDotNetCore.Services.JsonApiResourceService`2+<GetSecondaryAsync>d__11.MoveNext
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Services\JsonApiResourceService.cs:137
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult
  at JsonApiDotNetCore.Controllers.BaseJsonApiController`2+<GetSecondaryAsync>d__17.MoveNext
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Controllers\BaseJsonApiController.cs:131
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult
  at JsonApiDotNetCore.Controllers.JsonApiController`2+<GetSecondaryAsync>d__4.MoveNext
    C:\projects\jsonapidotnetcore\src\JsonApiDotNetCore\Controllers\JsonApiController.cs:65
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult
  at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor+TaskOfIActionResultExecutor+<Execute>d__0.MoveNext
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Threading.Tasks.ValueTask`1.get_Result
  at System.Runtime.CompilerServices.ValueTaskAwaiter`1.GetResult
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker+<<InvokeActionMethodAsync>g__Logged|12_1>d.MoveNext
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Runtime.CompilerServices.TaskAwaiter.GetResult
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker+<<InvokeNextActionFilterAsync>g__Awaited|10_0>d.MoveNext
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next
  at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker+<<InvokeInnerFilterAsync>g__Awaited|13_0>d.MoveNext
  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw
  at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess
  at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification
  at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd
  at System.Runtime.CompilerServices.TaskAwaiter.GetResult
  at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker+<<InvokeNextExceptionFilterAsync>g__Awaited|25_0>d.MoveNext

VERSIONS USED

• JsonApiDotNetCore version: 4.0.1
• ASP.NET Core version: 5.0
• Entity Framework Core version: 5.0
• Database provider: Pomelo.Mysql

[bart-degreed]

Fixed in https://github.com/json-api-dotnet/JsonApiDotNetCore/releases/tag/v4.0.2.

[woofi7]

@bart-degreed
The bug is still present.
During the execution, I enter the second if which put the resource on IIdentifiable

The relation between my 2 resources is a HasOne -> image is IIdentifiable.

public object OnReturnRelationship(object resourceOrResources)
{
    if (resourceOrResources is IEnumerable)
    {
        dynamic resources = resourceOrResources;
        return _resourceHookExecutor.OnReturn(resources, ResourcePipeline.GetRelationship).ToArray();
    }


    // This block
    if (resourceOrResources is IIdentifiable identifiable)
    {
        var resources = ToList(identifiable);
        return _resourceHookExecutor.OnReturn(resources, ResourcePipeline.GetRelationship).Single();
    }

    return resourceOrResources;
}

[woofi7]

@maurei
I have another problem, this time with the enumerable resources.

The relation is a OneToMany. When getting the secondary relation I get this error:
http://localhost:5000/api/v1/authors/8/social-links
'System.Collections.Generic.HashSet<LagendaBackend.Data.Models.SocialLink>' does not contain a definition for 'ToArray'

This error is from the first if in the same function as before.
https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/src/JsonApiDotNetCore/Hooks/Internal/ResourceHookExecutorFacade.cs#L125

Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'System.Collections.Generic.HashSet<LagendaBackend.Data.Models.SocialLink>' does not contain a definition for 'ToArray'
  at CallSite.Target
  at JsonApiDotNetCore.Hooks.Internal.ResourceHookExecutorFacade.OnReturnRelationship
    D:\workspace\JsonApiDotNetCore\src\JsonApiDotNetCore\Hooks\Internal\ResourceHookExecutorFacade.cs:126
  at JsonApiDotNetCore.Services.JsonApiResourceService`2+<GetSecondaryAsync>d__11.MoveNext
    D:\workspace\JsonApiDotNetCore\src\JsonApiDotNetCore\Services\JsonApiResourceService.cs:137

[farturi]

I just wrote a fix:
#932

[maurei]

@farturi I'll be looking into this issue tomorrow. Thanks for digging deep into it!

[maurei]

@farturi I have been unable to reproduce the issue.

The relation is a OneToMany. When getting the secondary relation I get this error:
http://localhost:5000/api/v1/authors/8/social-links

The scenario of one to many of this particular hook is covered in this test. Can you provide us with a repro example?

[bart-degreed]

@maurei change Author.Articles from IList to ISet and the test you linked to fails with the error mentioned:

Xunit.Sdk.TrueException
/api/v1/authors/1/articles returned InternalServerError status code with body: {"errors":[{"id":"37439262-ed5f-4f3c-afcc-caae7a5fb4ad","status":"500","title":"An unhandled error occurred while processing this request.","detail":"'System.Collections.Generic.HashSet<JsonApiDotNetCoreExample.Models.Article>' does not contain a definition for 'ToArray'","meta":{"stackTrace":["Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: 'System.Collections.Generic.HashSet<JsonApiDotNetCoreExample.Models.Article>' does not contain a definition for 'ToArray'\r","   at object CallSite.Target(Closure, CallSite, object)\r","   at TRet System.Dynamic.UpdateDelegates.UpdateAndExecute1<T0, TRet>(CallSite site, T0 arg0)\r","   at object JsonApiDotNetCore.Hooks.Internal.ResourceHookExecutorFacade.OnReturnRelationship(object resourceOrResources) in D:/Source/Repos/JsonApiDotNetCore/src/JsonApiDotNetCore/Hooks/Internal/ResourceHookExecutorFacade.cs:line 125\r","   at async Task<object> JsonApiDotNetCore.Services.JsonApiResourceService<TResource, TId>.GetSecondaryAsync(TId id, string relationshipName, CancellationToken cancellationToken) in D:/Source/Repos/JsonApiDotNetCore/src/JsonApiDotNetCore/Services/JsonApiResourceService.cs:line 137\r","   at async Task<IActionResult> JsonApiDotNetCore.Controllers.BaseJsonApiController<TResource, TId>.GetSecondaryAsync(TId id, string relationshipName, CancellationToken cancellationToken) in D:/Source/Repos/JsonApiDotNetCore/src/JsonApiDotNetCore/Controllers/BaseJsonApiController.cs:line 131\r","   at async Task<IActionResult> JsonApiDotNetCore.Controllers.JsonApiController<TResource, TId>.GetSecondaryAsync(TId id, string relationshipName, CancellationToken cancellationToken) in D:/Source/Repos/JsonApiDotNetCore/src/JsonApiDotNetCore/Controllers/JsonApiController.cs:line 65\r","   at async ValueTask<IActionResult> Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor+TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, object controller, object[] arguments)\r","   at TResult System.Runtime.CompilerServices.ValueTaskAwaiter<TResult>.GetResult()\r","   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()+Awaited(?)\r","   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()+Awaited(?)\r","   at void Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)\r","   at Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)\r","   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()+Awaited(?)\r","   at async Task Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextExceptionFilterAsync()+Awaited(?)"]}}]}
Expected: True
Actual:   False
   at JsonApiDotNetCoreExampleTests.Acceptance.ResourceDefinitionTests.Article_Through_Secondary_Endpoint_Is_Hidden() in D:\Source\Repos\JsonApiDotNetCore\test\JsonApiDotNetCoreExampleTests\Acceptance\ResourceDefinitions\ResourceDefinitionTests.cs:line 240
   at Xunit.Sdk.TestInvoker`1.<>c__DisplayClass48_1.<<InvokeTestMethodAsync>b__1>d.MoveNext() in C:\Dev\xunit\xunit\src\xunit.execution\Sdk\Frameworks\Runners\TestInvoker.cs:line 264
--- End of stack trace from previous location where exception was thrown ---
   at Xunit.Sdk.ExecutionTimer.AggregateAsync(Func`1 asyncAction) in C:\Dev\xunit\xunit\src\xunit.execution\Sdk\Frameworks\ExecutionTimer.cs:line 48
   at Xunit.Sdk.ExceptionAggregator.RunAsync(Func`1 code) in C:\Dev\xunit\xunit\src\xunit.core\Sdk\ExceptionAggregator.cs:line 90

[woofi7]

@maurei
I've pushed my repo to github in private. I've invited you as a collaborator to this repo!

[woofi7]

@maurei
I have tried to do the same fix as you have done for the SingleOrDefault for the ToArray at the line 125 and it seems to work In this situation!

https://github.com/json-api-dotnet/JsonApiDotNetCore/blob/master/src/JsonApiDotNetCore/Hooks/Internal/ResourceHookExecutorFacade.cs#L125
Become:
return Enumerable.ToArray(_resourceHookExecutor.OnReturn(resources, ResourcePipeline.GetRelationship));

[maurei]

Thank you. I suspected that Enumerable.ToArray was going to fix the problem, but I held it off because I wasn't sure where it originated from. Fixed in #938

[bart-degreed]

Fixes for these issues are in https://github.com/json-api-dotnet/JsonApiDotNetCore/releases/tag/v4.0.3. Thanks @woofi7, @farturi and @manuelTscholl for helping out on this.