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I have a before_filter hook in my main app's application controller that does something like: (It doesn't just put a link in the flash, there is a message, but it isn't relevant to the question, it just accesses the route in the method) class ApplicationController < ActionController::Base before_filter :set_link def set_link flash[:notice] = items_path end end This works fine for the app, however when I go into the controllers for an engine I made I get the exception No route matches {:controller=>"items", :action=>"index"} I understand that when in the engine, the routes helpers are for the engine unless prefixed with main_app So changing the method in the application controller to def set_link flash[:notice] = main_app.items_path end Gets rid of the exception but I really don't want to have to do that. Is there another solution to getting the engine to recognize the main_app routes? EDIT: This also happens if the application layout calls path helpers. So if the engine is designed to integrated into the main_app's layout then this issue will crop there up too.

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