feat: extend input type

Author: ksavosteev

src/VirtoCommerce.Xapi.Core/Helpers/GraphTypeExtensionHelper.cs

@@ -44,6 +44,11 @@ public static Type GetActualComplexType<TGraphType>() where TGraphType : IGraphT
             return GetActualComplexTypeRecursive(outerGraphType);
         }
 
+        public static Type GetActualComplexType(Type graphType)
+        {
+            return GetActualComplexTypeRecursive(graphType);
+        }
+
         private static Type GetActualComplexTypeRecursive(Type outerGraphType)
         {
             if (outerGraphType.IsGenericType && outerGraphType.GenericTypeArguments.Length > 0)

src/VirtoCommerce.Xapi.Core/Schemas/ExtendableGraphType.cs

@@ -10,6 +10,20 @@
 
 namespace VirtoCommerce.Xapi.Core.Schemas
 {
+    public class ExtendableInputObjectGraphType : ExtendableInputObjectGraph<object>
+    {
+    }
+
+    public class ExtendableInputObjectGraph<TSourceType> : InputObjectGraphType<TSourceType>
+    {
+        public override FieldType AddField(FieldType fieldType)
+        {
+            fieldType.Type = GraphTypeExtensionHelper.GetActualComplexType(fieldType.Type);
+
+            return base.AddField(fieldType);
+        }
+    }
+
     public class ExtendableGraphType<TSourceType> : ObjectGraphType<TSourceType>
     {
         public FieldType ExtendableField<TGraphType>(