主干 - 执行多个取（）渲染视图前 [英] Backbone - performing multiple fetch() before rendering a view

问题描述

我在想是不是最好的模式/方法。这是我的路由器功能，让用户点击报价/：身份证'，但对于这一观点来呈现，我需要他们的项目，客户和货币的列表。这将是确保所有3个取（）试图实例化 quotesEdit 视图之前发生的最好方法？是它认为不好的做法，当用户点击的东西抓住所有的信息？

  quotesEdit：功能（ID）{
        kf.Collections.quotes = kf.Collections.quotes ||新kf.Collections.Quotes（）;
        kf.Collections.projects = kf.Collections.projects ||新kf.Collections.Projects（）;
        kf.Collections.currencies = kf.Collections.currencies ||新kf.Collections.Currencies（）;
        //做一个取（）为上述3
        kf.Collections.customers = kf.Collections.customers ||新kf.Collections.Customers（）;
        VAR报价= kf.Collections.quotes.where（{ID形式：parseInt（ID，10）}）;
        kf.Utils.ViewManager.swap（'sectionPrimary'，新kf.Views.section（{
          部分：quotesEdit'，
          型号：报价[0]
        }））;
    }
 

解决方案

我觉得的组合jQuery的deferreds 和下划线的 引用 方法解决了这个优雅的：

  //调用获取的三个集合，并信守承诺
VAR完整= _.invoke（[行情，项目，货币]，'取'）;//当所有的人都完成...
$ .when.apply（$，完成）.done（函数（）{
   //一切准备就绪，并好去...
}）;
 

I was wondering about the best pattern/approach here. This is a function in my router, so the user hits 'quotes/:id', but for that view to render, I need a list of their projects, customers and currencies. What would be the best way to make sure all 3 fetches() have occurred before trying to instantiate the quotesEdit view? Is it considered bad practice to grab all the information when the user clicks something?

    quotesEdit: function(id) {
        kf.Collections.quotes = kf.Collections.quotes || new kf.Collections.Quotes();
        kf.Collections.projects = kf.Collections.projects || new kf.Collections.Projects();
        kf.Collections.currencies = kf.Collections.currencies || new kf.Collections.Currencies();
        //do a fetch() for the 3 above
        kf.Collections.customers = kf.Collections.customers || new kf.Collections.Customers();
        var quote = kf.Collections.quotes.where({Id: parseInt(id, 10)});
        kf.Utils.ViewManager.swap('sectionPrimary', new kf.Views.section({
          section: 'quotesEdit',
          model: quote[0]
        }));
    }

解决方案

I find a combination of jQuery deferreds and underscore's invoke method solves this elegantly:

//call fetch on the three collections, and keep their promises
var complete = _.invoke([quotes, projects, currencies], 'fetch');

//when all of them are complete...
$.when.apply($, complete).done(function() {
   //all ready and good to go...
});

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