Trace.sum(:size, :group => :user_id, :order => "sum_size DESC", :limit => 50).each do |user, count|
display_name = User.find(user).display_name.gsub('@', ' at ').gsub('.', ' dot ')
Trace.sum(:size, :group => :user_id, :order => "sum_size DESC", :limit => 50).each do |user, count|
display_name = User.find(user).display_name.gsub('@', ' at ').gsub('.', ' dot ')