Exception when enabling Lucene/Elasticsearch modules without enabling Queries module in GraphQL

[mdameer]

When trying to enable "Lucene" or "Elasticsearch" modules without enabling "Queries" module, then navigate to GraphiQL page it will return (500 Internal Server Error) with the following exception, due to trying resolve "IQueryManager" by "LuceneQueryFieldTypeProvider" and "ElasticQueryFieldTypeProvider":

System.NullReferenceException: Object reference not set to an instance of an object.
at OrchardCore.Queries.Lucene.GraphQL.Queries.LuceneQueryFieldTypeProvider.GetIdentifierAsync() in /Users/mdameer/Downloads/OrchardCore-main/src/OrchardCore.Modules/OrchardCore.Search.Lucene/GraphQL/LuceneQueryFieldTypeProvider.cs:line 33
at OrchardCore.Apis.GraphQL.Services.SchemaService.GetSchemaAsync() in /Users/mdameer/Downloads/OrchardCore-main/src/OrchardCore.Modules/OrchardCore.Apis.GraphQL/Services/SchemaService.cs:line 87
at OrchardCore.Apis.GraphQL.GraphQLMiddleware.ExecuteAsync(HttpContext context, ISchemaFactory schemaService, IDocumentWriter documentWriter) in /Users/mdameer/Downloads/OrchardCore-main/src/OrchardCore.Modules/OrchardCore.Apis.GraphQL/GraphQLMiddleware.cs:line 141
at OrchardCore.Apis.GraphQL.GraphQLMiddleware.Invoke(HttpContext context, IAuthorizationService authorizationService, IAuthenticationService authenticationService, ISchemaFactory schemaService, IDocumentWriter documentWriter) in /Users/mdameer/Downloads/OrchardCore-main/src/OrchardCore.Modules/OrchardCore.Apis.GraphQL/GraphQLMiddleware.cs:line 64

I think that we need to add "OrchardCore. Queries" as a required feature for GraphQL startup in both modules, or create new features for GraphQL in both modules and set "OrchardCore. Queries" as a dependency, what do you think?

[hishamco]

    [RequireFeatures("OrchardCore.Apis.GraphQL")]
    public class Startup : StartupBase
    {
        public override void ConfigureServices(IServiceCollection services)
        {
            services.AddSingleton<ISchemaBuilder, LuceneQueryFieldTypeProvider>();
        }
    }

I'm not sure how the GraphiQL page shows up without enable GraphQL feature?

[MikeAlhayek]

I think that we need to add "OrchardCore.Queries" as a required feature for GraphQL startup in both modules

@mdameer I agree with that statement.

[hishamco]

I thought @mdameer will start his first PR :)

[mdameer]

@hishamco it would have been a nice kick-off ;)