TaskModelProxy

Author: Yadro

src/modules/tasks/TaskFactory.ts

@@ -1,6 +1,7 @@
 import AbstractFactory from '../../base/AbstractFactory';
 import TasksByProject from './models/TasksByProject';
 import TaskModel from './models/TaskModel';
+import { TaskModelProxy, taskModelProxyHandler } from './models/TaskModelProxy';
 
 export default class TaskFactory extends AbstractFactory {
   createTasks(data: TasksByProject): TasksByProject {
@@ -10,4 +11,10 @@ export default class TaskFactory extends AbstractFactory {
     });
     return newData;
   }
+
+  createTaskProxy(taskModel: TaskModel): TaskModelProxy {
+    const target = new TaskModelProxy(taskModel);
+
+    return new Proxy<TaskModelProxy>(target, taskModelProxyHandler);
+  }
 }

src/modules/tasks/models/TaskModelProxy.ts

@@ -0,0 +1,26 @@
+import TaskModel from './TaskModel';
+
+export class TaskModelProxy extends TaskModel {
+  origin: TaskModel | null = null;
+}
+
+export const taskModelProxyHandler: ProxyHandler<TaskModelProxy> = {
+  get(target: TaskModelProxy, prop: string | symbol): any {
+    return target?.origin?.[prop as keyof TaskModel];
+  },
+  set(target: TaskModelProxy, prop: string | symbol, value: any): boolean {
+    if (prop === 'duration') {
+      console.error(
+        `TaskModel: Can't set prop '${prop.toString()}' in`,
+        target
+      );
+      return false;
+    }
+    // @ts-ignore
+    target[prop] = value;
+    // @ts-ignore
+    target.origin[prop] = value;
+
+    return true;
+  },
+};