Question

这是我的应用程序的代码示例

讨论模型

App.Discussion = Ember.Model.extend({
    id: Ember.attr(),
    title: Ember.attr(),
    body: Ember.attr(),
    course_id: Ember.attr(),
    replies: Ember.hasMany('App.Reply', {key:'replies', embedded: 'load'}),
    creator_id: Ember.attr(),
    creator_first_name: Ember.attr(),
    creator_last_name: Ember.attr(),
    status: Ember.attr(),
    created_at: Ember.attr(),
    accepted_answer_id: Ember.attr()
});

回复模型

App.Reply = Ember.Model.extend({
    id: Ember.attr(),
    body: Ember.attr(),
    discussion_id: Ember.attr(),
    discussion: Ember.belongsTo('App.Discussion', {key: 'discussion_id'}),
    creator_id: Ember.attr(),
    creator_first_name: Ember.attr(),
    creator_last_name: Ember.attr(),
    status: Ember.attr(),
    created_at: Ember.attr()
});

App.Discussion.Controller = Ember.ObjectController.extend({
  hasSomething: function() {
   // Here I want to check whether user_id = 101 in the replies array of the discussion Model. 
 // If any of the replies has the user_id as 101 return true.
  }.property('id')

});

我尝试将回复放入数组中，然后迭代并检查它。

replies = this.get('model.replies');

        replies.forEach(function(reply) {
           console.log(reply.get('creator_id'));
            if (window.userId === reply.get('creator_id')) {
                // do stuff here.
            }
        });

有没有更好的/ EMBER方式来实现这个???

Answer 1

Ember在他们的Array-object上有一些很好的帮手（除非你禁用原型扩展，否则也可以在常规阵列上使用）。

Array.isAny()可能值得一看。

hasSomething: function() {
  // Here I want to check whether user_id = 101 in the replies array of the discussion Model. 
  // If any of the replies has the user_id as 101 return true.
  var replies = this.get('model.replies');
  return replies.isAny('creator_id', window.userId);
}.property('model.replies.@each')

您可能还希望将属性设置为使用model.replies.@each实际观察回复数组。

Ember js在模型中迭代并检查值是否存在

1 个答案: