Accept structs in ObjectTypeAttribute<T> (#7116)

Author: PHILLIPS71

src/HotChocolate/Core/src/Types/Types/Attributes/ObjectTypeAttribute.cs

@@ -68,9 +68,9 @@ protected override void OnConfigure(
 /// interpreted as a GraphQL object type.
 /// This class is used by the Hot Chocolate source generator.
 /// </summary>
-[AttributeUsage(AttributeTargets.Class)]
+[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
 public sealed class ObjectTypeAttribute<T>
-    : Attribute where T : class
+    : Attribute
 {
     public Type Type => typeof(T);
 }

src/HotChocolate/Core/test/Types.Analyzers.Tests/BookType.cs

@@ -13,15 +13,25 @@ public class Book
     public string? Title { get; set; }
 
     public Author? Author => null;
+
+    public Publisher? Publisher => null;
 }
 
 public class Author
 {
     public string Name { get; set; } = default!;
 }
 
+public readonly record struct Publisher(string Name);
+
 [ObjectType<Author>]
 public static partial class AuthorNode
 {
     public static string Address([Parent] Author author) => "something";
 }
+
+[ObjectType<Publisher>]
+public static partial class PublisherNode
+{
+    public static string Company([Parent] Publisher author) => "something";
+}

src/HotChocolate/Core/test/Types.Analyzers.Tests/__snapshots__/SchemaTests.SchemaSnapshot.md

@@ -33,6 +33,11 @@ type Person implements Node & Entity {
   address: String!
 }
 
+type Publisher {
+  company: String!
+  name: String!
+}
+
 type Query {
   "Fetches an object given its ID."
   node("ID of the object." id: ID!): Node
@@ -50,6 +55,7 @@ type Query {
 type SomeBook {
   title: String
   author: Author
+  publisher: Publisher
 }
 
 type Subscription {