module ActiveAdmin::ResourceController::Collection::Sorting

def active_admin_collection
  sort_order(super)
end

def sort_order(chain)
  params[:order] ||= active_admin_config.sort_order
  if params[:order] && params[:order] =~ /^([\w\_\.]+)_(desc|asc)$/
    column = $1
    order  = $2
    table  = active_admin_config.resource_table_name
    table_column = (column =~ /\./) ? column :
      "#{table}.#{active_admin_config.resource_quoted_column_name(column)}"
    chain.reorder("#{table_column} #{order}")
  else
    chain # just return the chain
  end
end