refactor(frontend/activties/edit): hack around PromiseProxy

frontend/app/index/activities/edit/controller.js

@@ -19,6 +19,7 @@ import { timeout } from "ember-concurrency";
 export default class IndexActivitiesEditController extends Controller {
   @service notify;
   @service router;
+  @service store;
   @tracked changeset;
 
   /**
@@ -56,7 +57,29 @@ export default class IndexActivitiesEditController extends Controller {
     }
 
     try {
-      await this.changeset.save();
+      // this is an ugly mess, to get around the changeset using a PromiseProxy
+
+      const changeset = this.changeset;
+      const { comment, from, to, review, notBillable } = changeset;
+
+      const attributes = {
+        comment,
+        from,
+        to,
+        review,
+        notBillable,
+      };
+
+      const ref = this.model;
+      ref.task =
+        (await changeset.get("task.id")) &&
+        this.store.peekRecord("task", changeset.get("task.id"));
+
+      Object.entries(attributes).forEach(([k, v]) => {
+        ref[k] = v;
+      });
+
+      await ref.save();
 
       this.notify.success("Activity was saved");