Rails two-liner to redirect to url with sorted parameters

This is a good thing to do if your site relies on either a solid SEO strategy, OR if you use page caching which will consider the order of the params for its cache keys.

This works for Rails 3.2+

Older version of Rails will need to replace request#original_url with some other way to get the current full URL.

class ApplicationController < ActionController::Base

  before_filter :ensure_sorted_params

  def ensure_sorted_params
    # url_for(params) in later version of Rails will sort the params.
    sorted_url = url_for(params)

    # request#original_url is only available in Rails 3.2+
    redirect_to sorted_url if request.original_url != sorted_url
  end

end