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Apr 11
raising 404s in rails rails
From here comes a nice way of raising 404 errors in rails.
Inside application_controller.rb: 
class Error404 < StandardError
end

class ApplicationController < ActionController::Base
  rescue_from Error404, with: :render_404

  def render_404
    respond_to do |format|
      format.html{render file: "#{RAILS_ROOT}/public/404.html", status: 404}
      format.all{render nothing: true, status: 404}
    end
    true
  end

  # etc.
end
Then, inside the relevant controller: 
raise Error404
Also, as explained on the above website, the last line true in render_404 means you can 
render_404 and return