app/helpers/table_helper.rb
module TableHelper
def sortable(column, title = nil)
title ||= column.titleize
css_class = column == @sort_column ? "current #{@sort_direction}" : nil
direction = column == @sort_column && @sort_direction == :asc ? :desc : :asc
link_to title, { sort: column, direction: direction}, { class: css_class }
end
end