3 files changed, 13 insertions, 4 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index c67170573..23a8c05cc 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -84,6 +84,14 @@ export namespace Doc {
     export function GetT<T extends Field>(doc: Doc, key: string, ctor: FieldCtor<T>, ignoreProto: boolean = false): Field | null | undefined {
         return Cast(Get(doc, key, ignoreProto), ctor);
     }
+    export function MakeDelegate(doc: Opt<Doc>): Opt<Doc> {
+        if (!doc) {
+            return undefined;
+        }
+        const delegate = new Doc();
+        delegate.prototype = doc;
+        return delegate;
+    }
     export const Prototype = Symbol("Prototype");
 }
 
diff --git a/src/new_fields/Schema.ts b/src/new_fields/Schema.ts
index c7d2f0801..27b9635af 100644
--- a/src/new_fields/Schema.ts
+++ b/src/new_fields/Schema.ts
@@ -1,4 +1,4 @@
-import { Interface, ToInterface, Cast } from "./Types";
+import { Interface, ToInterface, Cast, FieldCtor, ToConstructor } from "./Types";
 import { Doc } from "./Doc";
 
 export type makeInterface<T extends Interface> = Partial<ToInterface<T>> & Doc;
@@ -42,6 +42,7 @@ export function makeStrictInterface<T extends Interface>(schema: T): (doc: Doc)
     };
 }
 
-export function createSchema<T extends Interface>(schema: T): T {
-    return schema;
+export function createSchema<T extends Interface>(schema: T): T & { prototype: ToConstructor<Doc> } {
+    schema.prototype = Doc;
+    return schema as any;
 }
diff --git a/src/new_fields/Types.ts b/src/new_fields/Types.ts
index 416298a64..cafb208ce 100644
--- a/src/new_fields/Types.ts
+++ b/src/new_fields/Types.ts
@@ -53,6 +53,6 @@ export function Cast<T extends FieldCtor<Field>>(field: Field | null | undefined
     return undefined;
 }
 
-export function FieldValue<T extends Field>(field: Opt<Field> | Promise<Opt<Field>>): Opt<Field> {
+export function FieldValue<T extends Field>(field: Opt<T> | Promise<Opt<T>>): Opt<T> {
     return field instanceof Promise ? undefined : field;
 }