Ember-Octane：更新时无法在模板中观察到 Obj？

Question

你们大多数人都认为这是一个棘手的问题。我也是。。。

所以，这是一个控制器文件，我有

application.js
export default class Application extends Controller.extend(someMixin)  {
@tracked markedValues = {
item1: {content: "This is item1", count: 1}
item2: {content: "This is item2", count: 1}
}
@action updateCount(itemKey) {
this.markedValues[itemKey].count = this.markedValues[itemKey].count + 1;
this.markedValues = {...this.markedValues}
}
}
application.hbs
{{#each-in this.markedValues as |key value|}}
<div {{on "click" (fn this.updateCount key)}}>{{value.content}} and number is {{value.count}}</div>
{{/each}}

当我更新计数时，它从未反映在模板中。我在这个地方犯了什么错误？

Answer 1

问题是没有跟踪内部属性count。

这里有一种解决方法：

import Controller from '@ember/controller';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';
class Item {
@tracked count;
constructor(content, count) {
this.content = content;
this.count = count;
}
}
export default class ApplicationController extends Controller {
@tracked markedValues = {
item1: new Item("This is item1", 1),
item2: new Item("This is item2", 1)
}
@action updateCount(itemKey) {
this.markedValues[itemKey].count = this.markedValues[itemKey].count + 1;
this.markedValues = {...this.markedValues}
}
}

请在此处查看它的工作情况：https://ember-twiddle.com/5e9f814ccf60821b4700b447f1898153?openFiles=controllers.application%5C.js%2C