javascript - 存储在数组中的 Ember.js 绑定(bind)模型

Question

当模型存储在数组中时，从一个模型绑定(bind)到另一个模型的“正确”方法是什么？通常我会想象这将是 Controller 的 content 数组，但为了保持示例简单:

MyApp.websites = [];
MyApp.websites.push(Ember.Object.create({
  name: "Stackoverflow"
}));

MyApp.websites.push(Ember.Object.create({
  name: "Serverfault"
}));

MyApp.favorite = Ember.Object.create({
  // how should this be bound to a specific element of MyApp.websites?
  nameBinding: ?????????
});

Answer 1

您可以使用一个属性来绑定(bind)它。

这样:

MyApp.websites = [];
MyApp.websites.push(Ember.Object.create({
  name: "Stackoverflow"
}));

MyApp.websites.push(Ember.Object.create({
  name: "Serverfault"
}));

MyApp.mainController = Ember.Object.create({
  currentWebsiteIndex: 0,
  currentWebsite: function() {
    return MyApp.websites[this.get("currentWebsiteIndex")];
  }.property("currentWebsiteIndex")
});

MyApp.favorite = Ember.Object.create({
  // how should this be bound to a specific element of MyApp.websites?
  nameBinding: "MyApp.mainController.currentWebsite.name"
});

这只是为了演示这个想法，更好的实现是:

MyApp.websites = Ember.ArrayProxy.create({
  content: [],
  currentWebsiteIndex: 0,
  currentWebsite: function() {
    return this.objectAt(this.get("currentWebsiteIndex"));
  }.property("currentWebsiteIndex")
});

MyApp.websites.pushObject(Ember.Object.create({
  name: "Stackoverflow"
}));

MyApp.websites.pushObject(Ember.Object.create({
  name: "Serverfault"
}));

MyApp.favorite = Ember.Object.create({
  // how should this be bound to a specific element of MyApp.websites?
  nameBinding: "MyApp.websites.currentWebsite.name"
});