1 files changed, 13 insertions, 1 deletions
diff --git a/src/controllers/DocumentReferenceController.ts b/src/controllers/DocumentReferenceController.ts
index 9d5bb7af2..9cf128614 100644
--- a/src/controllers/DocumentReferenceController.ts
+++ b/src/controllers/DocumentReferenceController.ts
@@ -1,4 +1,4 @@
-import { FieldController } from "./FieldController";
+import { FieldController, Opt } from "./FieldController";
 import { DocumentController } from "./DocumentController";
 import { KeyController } from "./KeyController";
 import { DocumentUpdatedArgs } from "./FieldUpdatedArgs";
@@ -22,6 +22,18 @@ export class DocumentReferenceController extends FieldController {
         this.FieldUpdated.emit(args.fieldArgs);
     }
 
+    protected DereferenceImpl() : Opt<FieldController> {
+        return this.document.GetField(this.key);
+    }
+
+    protected DereferenceToRootImpl(): Opt<FieldController> {
+        let field: Opt<FieldController> = this;
+        while (field instanceof DocumentReferenceController) {
+            field = field.Dereference();
+        }
+        return field;
+    }
+
     TrySetValue(value: any): boolean {
         throw new Error("Method not implemented.");
     }