问题
I want to be able to override models and controllers of my rails 3 engine in the base app.
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).
So, what's the best way to extend engine's models/controllers in rails 3 without copying them to base app?
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.
回答1:
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::Concern
More details here, http://guides.rubyonrails.org/engines.html#overriding-models-and-controllers
(edited. Changed from "edgeguides" subdomain to "guides" subdomain)
来源：https://stackoverflow.com/questions/4009553/how-to-override-rails-3-engine-models-and-controllers-in-the-main-application