javascript - 模型计算属性未更新

Question

为什么除非刷新页面，否则计算属性 student.successful Evaluations 不会更新？

http://emberjs.jsbin.com/keduco/edit?html,js,output

App.Student = DS.Model.extend({
  username: DS.attr('string'),
  evaluations: DS.hasMany('evaluation'),
  successfulEvaluations: Ember.computed.filter('evaluations.@each.grade', function(evaluation, index, array){
    return evaluation.get('grade') >= 10;
  })
});

App.Evaluation = DS.Model.extend({
  subject: DS.attr('string'),
  grade:   DS.attr('number'),
  student: DS.belongsTo('student')
});

Ember : 2.2.0
Ember Data : 2.2.1

Answer 1

EmberJS 2.1/2.2 中似乎存在关于 @each computed properties 的错误.有一种解决方法是使用 content.@each 而不是 @each (有关详细信息，请参阅问题)

successfulEvaluations: Ember.computed.filter('evaluations.content.@each.grade', function(evaluation, index, array){
   return evaluation.get('grade') >= 10;
})