如何在主应用程序中覆盖 Rails 3 引擎模型和控制器? [英] how to override rails 3 engine models and controllers in the main application?

问题描述

我希望能够在基础应用中覆盖 Rails 3 引擎的模型和控制器.

I want to be able to override models and controllers of my rails 3 engine in the base app.

检查 $LOAD_PATH，我在那里找到了引擎的 'app/{models,controllers}'，但我不能明确要求引擎的模型或控制器文件: require 'engine_name/model_name' 失败并显示没有这样的文件"(尝试使用命名空间(app/controllers/enginename/*)和普通引擎).

Inspecting $LOAD_PATH, I found engine's 'app/{models,controllers}' there, but I can't explicitly require engine's model or controller file: require 'engine_name/model_name' fails with "no such file" (tried with both namespaced(app/controllers/enginename/*) and plain engine).

那么，在不将它们复制到基础应用程序的情况下，在 Rails 3 中扩展引擎模型/控制器的最佳方法是什么?

So, what's the best way to extend engine's models/controllers in rails 3 without copying them to base app?

基本上，这是一个加载顺序问题.所以，如果我明确要求引擎提供模型，一切都可以，但我希望有更好的方法.

Basically, it's a load order problem. So, if I explicitly require model from engine, everything's ok, but I hope there is a better way.

推荐答案

所以我实际上回去写了文档.答案是使用其中之一打开控制器类和模型类，

So I actually went back and wrote the documentation. The answer is to Open Class the Controller and Model classes using either,

• Class#eval_class
• ActiveSupport::关注

这里有更多细节，http://guides.rubyonrails.org/engines.html#overriding-models-和-控制器

(已编辑.从edgeguides"子域更改为guides"子域)

(edited. Changed from "edgeguides" subdomain to "guides" subdomain)

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