javascript - Ember.js Route.setupController 和 ObjectController

Question

我很困惑为什么Route和Controller会影响默认的Model。这是一个例子。

App.ApplicationRoute = Ember.Route.extend({
    setupController: function(controller, model) {
        this._super(controller, model);
        console.log(model); //returns undefined
        controller.set("title", "Page title");
    }
});

上面的代码片段工作没有错误；模板按预期打印 {{title}} 。请注意，该模型是“未定义的”。

App.ApplicationRoute = Ember.Route.extend({
    setupController: function(controller, model) {
        this._super(controller, model);
        console.log(model); //returns undefined
        controller.set("title", "Page title");
    }
});

App.ApplicationController = Ember.ObjectController.extend({});

上面的代码抛出错误 ...

(Error while processing route: index Assertion Failed: Cannot delegate set('title', Page title) to the 'content' property of object proxy : its 'content' is undefined.)

...并产生一个空白页。解决方案是返回模型(空白对象)或使用Controller(默认行为)而不是ObjectController。有人可以解释一下这种特殊情况吗？为什么 Ember 在使用 ObjectController 时不假设一个空对象？是否假设对象将从商店或服务器传入或检索？

App.ApplicationRoute = Ember.Route.extend({
    model: function() {
        return {};
    },
    setupController: function(controller, model) {
        this._super(controller, model);
        console.log(model);
        controller.set("title", "Page title");
    }
});

App.ApplicationController = Ember.ObjectController.extend({});

Answer 1

如 Ember docs 中所述:

Ember.ObjectController is part of Ember's Controller layer. It is intended to wrap a single object, proxying unhandled attempts to get and set to the underlying model object, and to forward unhandled action attempts to its target.

ObjectController 期望存在一个模型并将其设置为内容。它基本上是单个对象的包装。