Rails SortableMethods

sortable_controller_methods.rb

# lib/sortable_controller_methods.rb (must then load lib files manually)
# Add in "sortable" controllers:
# include SortableControllerMethods
#
# As in http://railscasts.com/episodes/147-sortable-lists
module SortableControllerMethods
  def sort
    klass.all.each do |object|
      object.position = params[object.class.to_s.downcase].index(object.id.to_s) + 1
      object.save
    end
    render :nothing => true
  end

  # May be common index action (or where sort options are displayed)
  def order
    instance_variable_set("@" + controller_name, klass.all)
  end

  def klass
    controller_name.singularize.camelize.constantize
  end
end