Ember.js 余烬/余烬数据属于STO，并且有许多未按预期更新

我有两种型号：

App.Focusarea = DS.Model.extend
    definition: DS.attr('string')
    theme: DS.belongsTo('theme',
        async: true
    )

App.Theme = DS.Model.extend
    definition: DS.attr('string')
    focusareas: DS.hasMany('focusarea',
        async: true
    )

在创建每个主题时，我希望将焦点区域与该主题相关联

theme = store.createRecord("theme",
    id: 3
    definition: 'theme definition'
)

focusarea = store.createRecord("focusarea",
    id: 4
    definition: 'focusarea definition'
)

theme.get("focusareas").then (focusareas) ->
    focusareas.pushObject focusarea
    theme.save()

但是当我运行测试时

    theme.get('focusareas').then (focusareas)->
        expect(focusareas.toArray.length).to.equal(1)

失败-focusreas.toArray.length等于0，换句话说，关联失败。 我做错了什么？我错过了什么？任何帮助都将不胜感激

更新：

弄明白了，theme.get（'focusareas'）返回一个未解析的承诺，即0，解析后将返回1，例如：

focusareas = theme.get('focusareas')
focusareas.then ->
    console.log focusareas.get('length') #=1

或

换句话说

store.find('theme', 4).then (theme)->
    theme.get('focusareas').then ->
        theme.get('focusareas').forEach (item) ->
            console.log(item.get('definition')) #'focusarea definition'
            item.get('theme').then ->
                console.log(item.get('theme').get('definition')) #'theme definition'

---

我想我应该做RTFM

在对象初始化期间，需要将

focusreas

分配给getter和setter可以使用的某种集合。在这种情况下，

ArrayProxy

会很好地工作。哪怕是一个你可以自动排序的项目呢

theme = store.createRecord("theme",
    id: 3
    definition: 'theme definition',
    focusareas: Ember.ArrayProxy.createWithMixins Ember.SortableMixin,
      content: [],
      sortProperties: ['id'], // Set this to any object property
      sortAscending: true
)

---

希望有帮助

非常感谢你的提示，马修。我也明白了，theme.get（'focusareas'）返回一个未解决的承诺，即0，解决后将返回1

theme = store.createRecord("theme",
    id: 3
    definition: 'theme definition',
    focusareas: Ember.ArrayProxy.createWithMixins Ember.SortableMixin,
      content: [],
      sortProperties: ['id'], // Set this to any object property
      sortAscending: true
)