GraphQL Error

[kevinsmgov]

I'm getting an error from GraphQL and I'm having trouble diagnosing it. It's complaining about a content part with no fields but I have checked my Documents table and every instance of that content part has the contained field. I'm also not finding the method names that the error is reporting in the Orchard Core source code (e.g. GraphQL.Utilities.SchemaValidationVisitor.VisitObject).

Is there anyone familiar with GraphQL that can take a look at this and point me in the right direction?

System.InvalidOperationException: An Object type 'PhotoGalleryPart' must define one or more fields.\r\n   at GraphQL.Utilities.SchemaValidationVisitor.VisitObject(IObjectGraphType type, ISchema schema) in /_/src/GraphQL/Utilities/Visitors/SchemaValidationVisitor.cs:line 34\r\n   at GraphQL.SchemaExtensions.Run(ISchemaNodeVisitor visitor, ISchema schema) in /_/src/GraphQL/SchemaExtensions.cs:line 271\r\n   at GraphQL.Types.Schema.Validate() in /_/src/GraphQL/Types/Schema.cs:line 416\r\n   at GraphQL.Types.Schema.CreateAndInitializeSchemaTypes() in /_/src/GraphQL/Types/Schema.cs:line 386\r\n   at GraphQL.Types.Schema.Initialize() in /_/src/GraphQL/Types/Schema.cs:line 149\r\n   at OrchardCore.Apis.GraphQL.Services.SchemaService.GetSchemaAsync()\r\n   at OrchardCore.Apis.GraphQL.GraphQLMiddleware.ExecuteAsync(HttpContext context, ISchemaFactory schemaService, IDocumentWriter documentWriter)\r\n   at OrchardCore.Apis.GraphQL.GraphQLMiddleware.Invoke(HttpContext context, IAuthorizationService authorizationService, IAuthenticationService authenticationService, ISchemaFactory schemaService, IDocumentWriter documentWriter)\r\n   at SixLabors.ImageSharp.Web.Middleware.ImageSharpMiddleware.Invoke(HttpContext httpContext, Boolean retry)\r\n   at OrchardCore.Media.Services.MediaFileStoreResolverMiddleware.Invoke(HttpContext context)\r\n   at OrchardCore.Liquid.ScriptsMiddleware.Invoke(HttpContext httpContext)\r\n   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)\r\n   at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context)\r\n   at OrchardCore.Diagnostics.DiagnosticsStartupFilter.<>c__DisplayClass3_0.<<Configure>b__1>d.MoveNext()\r\n--- End of stack trace from previous location ---\r\n   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.Invoke(HttpContext context)\r\n   at OrchardCore.Modules.ModularTenantRouterMiddleware.Invoke(HttpContext httpContext)\r\n   at OrchardCore.Modules.ModularTenantContainerMiddleware.<>c__DisplayClass4_0.<<Invoke>b__0>d.MoveNext()\r\n--- End of stack trace from previous location ---\r\n   at OrchardCore.Environment.Shell.Scope.ShellScope.UsingAsync(Func`2 execute, Boolean activateShell)\r\n   at OrchardCore.Environment.Shell.Scope.ShellScope.UsingAsync(Func`2 execute, Boolean activateShell)\r\n   at OrchardCore.Environment.Shell.Scope.ShellScope.UsingAsync(Func`2 execute, Boolean activateShell)\r\n   at OrchardCore.Environment.Shell.Scope.ShellScope.UsingAsync(Func`2 execute, Boolean activateShell)\r\n   at OrchardCore.Modules.ModularTenantContainerMiddleware.Invoke(HttpContext httpContext)\r\n   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

[kevinsmgov]

I have a clue about this error. The ContentPart in question only contains a single custom field that we use to reference images from the Bynder digital asset management system. Since GraphQL wouldn't know how to query that custom field type, assumably it strips it out, leaving an empty part.

Now, we have other empty ContentPart definitions in our schema that GraphQL doesn't have an issue with - we use them as place holders in content items so that DisplayDrivers can fill in related data (e.g. using the ContentPickerFieldIndex to list items that point to the current item). So, we just need to figure out where in the GraphQL stack these two processes occur (filtering out truly empty content parts and filtering out unknown field types that leave empty content parts) so that if the second condition occurs it's treated like the first condition.

Which contributors to Orchard Core are the GraphQL experts? I'd be happy to make the coding changes if someone can point me to the relevant methods (with all the dependency injection in the system, I haven't been able to track them down yet).

[kevinsmgov]

#13148 fixes this issues