Passing all implemented interfaces to object

Sources/GraphZahl/Resolution/OutputResolvable/Implementations/Object/GraphQLObject+resolve.swift

@@ -20,7 +20,7 @@ extension GraphQLObject {
 
         let interfaces = try inheritance
             .compactMap { $0 as? GraphQLObject.Type }
-            .map { try context.resolveInterface(object: $0) } + propertyResults.compactMap(\.interface)
+            .map { try context.resolveInterface(object: $0) } + propertyResults.flatMap(\.interfaces)
 
         let type = try GraphQLObjectType(name: concreteTypeName, fields: fields, interfaces: interfaces) { value, _, _ in value is Self }
 

Sources/GraphZahl/Resolution/OutputResolvable/Implementations/Object/PropertyWrappers/Inline.swift

@@ -38,7 +38,7 @@ extension Inline: CustomGraphQLProperty {
             }
         }
 
-        return .interface(interface, fields: fields)
+        return .interfaces([interface] + object.interfaces, fields: fields)
     }
 
 }

Sources/GraphZahl/Resolution/OutputResolvable/Implementations/Object/PropertyWrappers/PropertyResult.swift

@@ -3,7 +3,7 @@ import GraphQL
 
 enum PropertyResult {
     case field(String, GraphQLField)
-    case interface(GraphQLInterfaceType, fields: [String : GraphQLField])
+    case interfaces([GraphQLInterfaceType], fields: [String : GraphQLField])
     case ignore
 }
 
@@ -13,15 +13,15 @@ extension PropertyResult {
         switch self {
         case .field(let name, let field):
             return [name : field]
-        case .interface(_, let fields):
+        case .interfaces(_, let fields):
             return fields
         case .ignore:
             return [:]
         }
     }
 
-    var interface: GraphQLInterfaceType? {
-        guard case .interface(let interface, _) = self else { return nil }
+    var interfaces: [GraphQLInterfaceType] {
+        guard case .interfaces(let interface, _) = self else { return [] }
         return interface
     }