track sql duration

gistfile1.rb

def track_sql(&block)
  timing = Hash.new 0
  track = ->(_,start,finish,_,data) do
    Thread.exclusive do
      timing[data[:name]] += (finish - start)
    end
  end

  ActiveSupport::Notifications.subscribed(track, 'sql.active_record', &block)
  timing
end