Ember数据：如何在不同集合的集合中获取模型的聚合列表（@each not working） [英] Ember-data: How do I get an aggregated list of models in a collection on a different collection (@each not working)

问题描述

我正在尝试获得员工的汇总列表。每个组织是 hasMany 员工的模型。

I am trying to get an aggregated list of employees. Each organization is a model that hasMany employees.

var Organization = DS.Model.extend({
    name:       attr('string'),
    employees: hasMany('employee', { async: true })
});

在我的控制器上，我有这个属性。

On my controller, I have this property.

employees: function(){

    var employees =[];

    this.get('organizations').forEach(function(organization){
        employees.pushObjects(organization.get('employees'));
    });

    return employees;

}.property('[e-mail]')

当我在模板上循环访问这些时，正在加载员工，我可以看到api返回数据（Im使用 async：true ），但返回值 employees 仍然是一个空数组。

When I loop through these on the template, the employees are being loaded, I can see the api returning the data (Im using async: true), but the return value of employees is still an empty array.

似乎我可能正在收听财产上的错误事项。请帮助。

It seems like I might be listening to the wrong thing on the property. Please help.

推荐答案

Ember不支持多个级别的依赖属性。

Ember doesn't support dependent properties multiple levels deep.

http://emberjs.com/guides/对象模型/计算属性和聚合数据/

当您尝试推送这个属性时，您的员工是一个异步属性将为空时尚。您需要将履行的员工提高到更高级别（如下所示）：

And your employees being an async property will be empty when you attempt to push in this fashion. You'd need to move the fulfilled employees a level higher (something like this):

var Organization = DS.Model.extend({
    name:       attr('string'),
    employees: hasMany('employee', { async: true }),
    loadedEmployees: function(){
      return this.get('employees');
    }.property('employees.[]')
});

使用 loadedEmployees

employees: function(){

  var employees =[];

  this.get('organizations').forEach(function(organization){
    employees.pushObjects(organization.get('loadedEmployees'));
  });

  return employees;

}.property('[e-mail]')

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