在资产管道中路由助手 [英] Route helpers in asset pipeline

问题描述

使用Rails 3.1.0.rc4，我正在尝试访问javascript文件中的路由助手（在本例中为event.js.erb），看起来它们当时没有加载。当请求合并的/assets/application.js文件时，我得到：

using Rails 3.1.0.rc4, I'm trying to access a route helper in a javascript file (event.js.erb in this case) and it seems like they are not loaded at that moment. When requesting the merged /assets/application.js file, I get:

throw Error("NameError: undefined local variable or method `events_path' for #<#<Class:0x00000001580010>:0x00000003191510>\n  (in /<...>/app/assets/javascripts/event.js.erb)")

知道如何在那里访问路线助手吗？

Any idea how to access the route helper in there?

推荐答案

更新：现在有一个宝石可以帮到你： js -routes

UPDATE: Now there is a gem that does this for you: js-routes

问题是Sprockets正在评估Rails应用程序上下文之外的ERB，你所期待的大部分东西都不存在。

The problem is that Sprockets is evaluating the ERB outside of the context of your Rails app, and most of the stuff you're expecting isn't there.

你可以像你这样在Sprockets上下文中添加东西：

You can add things to your Sprockets context like so:

Rails.application.assets.context_class.class_eval do
  include Rails.application.routes.url_helpers
end

这一切都很好，但是获得需要id工作的助手却有点棘手。我将使用一种名为 URI模板的技术：

That's all well and good, but getting the helpers that require an id to work is a little trickier. I'm going to use a technique called a URI Template:

var event_path = "<%= CGI.unescape event_path('{event_id}') %>";

返回 / events / {event_id} 您可以使用像 {event_id：1} 这样的对象将其呈现到网址中。请参阅SugarJS的 String＃assign 方法作为此示例实现。您也可以像我一样推出自己的做了。

which returns /events/{event_id} which you could render into a url using an object like { event_id: 1 }. See SugarJS's String#assign method as example implementation of this. You could also roll your own like I did.

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