Catch Unknown action in Rails 3 for custom 404

Question

I want to catch unknown action error in Rails 3, that shows \"Unknown Action\" error on development and the 404.html on production. I tried putting this rescue_from

Answer 1

If you really want to rescue AbstractController::ActionNotFound in a controller, you can try something like this:

class UsersController < ApplicationController

  private

  def process(action, *args)
    super
  rescue AbstractController::ActionNotFound
    respond_to do |format|
      format.html { render :404, status: :not_found }
      format.all { render nothing: true, status: :not_found }
    end
  end


  public

  # actions must not be private

end

This overrides the process method of AbstractController::Base that raises AbstractController::ActionNotFound (see source).