为什么不收集骨干获取回报的承诺 [英] Why doesn't Backbone Collection fetch return a promise

问题描述

下面的例子code效果很好：

  Auth_controller.prototype.isLogged =功能（）{
    //检查用户进行身份验证
    变种getAuthStatus = this.auth_model.fetch（）;
    返回getAuthStatus;
};Auth_controller.prototype.redirect =功能（片段，指定参数时，下一个）{    变种getAuthStatus = this.isLogged（）;
    VAR自我=这一点;    $。当（getAuthStatus）。然后（功能（响应）{
        //做一些与响应
    }
}）;
 

这似乎并不为采集工作虽然。结果
当我控制台日志的收集，我得到一个空回。

我知道我可以在方法（测试已经）中使用成功的回调函数从，但我不想这样做，因为我希望函数返回，我可以从其他功能调用一个承诺好。结果
的修改的 - >没有，对不起它不会成功回调或者看起来是这样的工作。

的解决方法，有什么建​​议？

Edit（编辑）

这个图像显示了从模型和收集获取方法返回。结果
除非我做错了什么是显而易见的，我不明白为什么会这样。结果
当控制台登录成功回调返回的响应，我认为这是屏幕截图显示的空对象，被填充。

EDIT2：

这是我收集的样子：

 定义（[
  / * --- ---库* /
  jQuery的，
  下划线，
  '骨干'，  / * ---型号--- * /
  模型/用户/ role_model]函数（$，_，骨干，
                好榜样）{    VAR Role_collection = Backbone.Collection.extend（{
        网址：'/ ingeb / api_v1 /用户/角色，
        型号：Role_model
    }）;    返回Role_collection;}）;
 

解决方案

事实上，集合的取并返回一个承诺：

  

封面定制的持久性策略下，代表们Backbone.sync并返回一个jqXHR。

请参阅 http://backbonejs.org/#Collection-fetch 并的 http://api.jquery.com/jQuery.ajax/#jqXHR

The following example code works well:

Auth_controller.prototype.isLogged = function(){ 
    //Check if the user is authenticated 
    var getAuthStatus = this.auth_model.fetch(); 
    return getAuthStatus; 
}; 

Auth_controller.prototype.redirect = function(fragment, args, next){ 

    var getAuthStatus = this.isLogged(); 
    var self = this; 

    $.when(getAuthStatus).then(function(response){ 
        //Do something with the response 
    }
}); 

This doesn't seem to work for a Collection though.
When I console log the collection, I get an empty collection back.

I know that I can use the success callback function from within the method (tested that already), but I don't want to do that, because I want the function to return a promise that I can call from other functions as well.
Edit -> No, sorry it doesn't work in the success callback either so it seems.

Any suggestions for a workaround ?

Edit;

This image shows what is returned from the model and collection fetch methods.
Unless I'm doing something wrong that is obvious, I don't understand why this happens.
When console logging the returned response in the success callback, I see that the empty object as shown in the screenshot, gets populated.

Edit2:

This is what my collection looks like:

define([
  /*--- libraries ---*/
  'jquery',     
  'underscore', 
  'backbone', 

  /*--- model ---*/
  'models/users/role_model'

], function($, _, Backbone, 
                Role_model){

    var Role_collection = Backbone.Collection.extend({ 
        url: '/ingeb/api_v1/users/roles', 
        model: Role_model 
    }); 

    return Role_collection; 

}); 

解决方案

Actually, the collection's fetch does return a promise:

Delegates to Backbone.sync under the covers for custom persistence strategies and returns a jqXHR.

See http://backbonejs.org/#Collection-fetch and http://api.jquery.com/jQuery.ajax/#jqXHR

这篇关于为什么不收集骨干获取回报的承诺的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！