复杂类型的 HotChocolate (GraphQL) 模式第一种方法

Question

I'm novice in HotChocolate and I'm trying to PoC some simple usage. I've created very simple .graphql file:

#camera.graphql

type Camera {
    id: ID!
    name: String!
}

type Query {
    getCamera: Camera!
}

And a very simple .NET code for camera wrapping:

    public class QlCamera
    {
        public static QlCamera New()
        {
            return new QlCamera
            {
                Id = Guid.NewGuid().ToString(),
                Name = Guid.NewGuid().ToString()
            };
        }

        public string Id { get; set; }
        public string Name { get; set; }
    }

as well as such for schema creation:

   public void CreateSchema()
   {
        string path = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

        var smBuilder = SchemaBuilder.New();
        smBuilder.AddDocumentFromFile(path + "/GraphQL/camera.graphql");

        smBuilder.AddResolver("Query", "getCamera", () => QlCamera.New());

        var schema = smBuilder.Create();
   }

On the last line however I do get an exception : HotChocolate.SchemaException: 'Multiple schema errors occured: The field Camera.id has no resolver. - Type: Camera The field Camera.name has no resolver. - Type: Camera '

I've tried to create :

    public class QlCameraType : ObjectType<QlCamera>
    {
        protected override void Configure(IObjectTypeDescriptor<QlCamera> descriptor)
        {
            descriptor.Name("Camera");

            descriptor.Field(t => t.Id).Type<NonNullType<StringType>>();
            descriptor.Field(t => t.Name).Type<StringType>();
        }
    }

and to replace

smBuilder.AddResolver("Query", "getCamera", () => QlCamera.New());

with

smBuilder.AddResolver("Query", "getCamera", () => new QlCameraType());

But I continue to get the same exception.

Obviously I miss something here, But I cannot understand what exactly. Could someone explain me what I do miss ?

(I've passed few times trough the documentation, but I cannot find relevant help there)

Answer 1

As exception clearly states - there are no revolvers bind for the particular fields ("id" and "name") of the "Camera" type/object.

So they just have to be added with :

smBuilder.AddResolver("Camera", "id", rc => rc.Parent<QlCamera>().Id);
smBuilder.AddResolver("Camera", "name", rc => rc.Parent<QlCamera>().Name);

And that is it.