pushObject到parent中有很多关系

Question

当尝试将新创建的对象推送到具有多个关系的父级时,我运行错误:

Assertion failed: The content property of DS.PromiseArray should be set before modifying it

这是我的代码.

    App.User = DS.Model.extend({
        name : DS.attr('string'),
        selections : DS.hasMany('selection', {async: true}),
        creationDate : DS.attr('date')
    });

    App.Selection = DS.Model.extend({
        value : DS.attr('string')
    });

    App.PollController = Ember.ObjectController.extend({
        actions: {
            save: function(){
                // create new user record in store
                var newUser = this.store.createRecord('user', {
                    name : this.get('newUserName'),
                    creationDate : new Date()
                });

                // create new selection record in store
                var newSelection = this.store.createRecord('selection', {
                    id : 11,
                    value : "hallo"
                });

                // push selection to user
                newUser.get('selections').pushObject(newSelection);

                // save new user
                newUser.save();
            }
        }
    });

当我试图将newSelection对象推送到选择用户模型数组时出错.

还尝试将行更改为

                // push selection to user
                newUser.get('selections').then(function(selections){
                    selections.pushObject(newSelection);
                });

然后我没有收到错误,但newSelection没有被推送给用户.选择用户数组保持为空.

我做错了什么？我完全错了吗？或者EmberJs/Ember数据中有错误吗？

我使用的是EmberJS 1.2.0和Ember Data beta 5.

Answer 1

我假设您说保存没有发回选择,导致您添加的代码是正确的.

重要的是要注意承诺是异步发生的

            newUser.get('selections').then(function(selections){
                // this will happen after save
                selections.pushObject(newSelection);
            });

            newUser.save();

您应该等待保存,直到按下选择

http://emberjs.jsbin.com/gotasa/1/edit?html,js,output

            newUser.get('selections').then(function(selections){
                selections.pushObject(newSelection);
                newUser.save();
            });