Adds order functionality to your ActiveRecord models so that your controllers have shared interface for accepting column/direction params.

Add this line to your application's Gemfile:

gem 'order_by'

And then execute:

$ bundle

Include Orderable concern to the model you want to act as orderable:

class Posts
  include Orderable
end

Now you can use it in your controller like this:

class PostsController
  def index
    @posts = Post.order_by(params[:sort_column], params[:sort_direction])
  end
end

I was inspired by this gist and thought it would be useful as a gem