Dynamic error pages in Rails 3

In rails 3.2, it’s easier than that:

Add this to config/application.rb:

config.exceptions_app = self.routes

That causes errors to be routed via the router. Then you just add to config/routes.rb:

match "/404", :to => "errors#not_found"

I got this info from item #3 on the blog post “My five favorite hidden features in Rails 3.2” by By José Valim.

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