gistfile1.rb

  def chart_health_tracker_data(health_tracker_entry_list, header, method, days_back = 7)
    start_day = Date.today - days_back + 1
    day_labels = []
    exercise_points = []
    calorie_points = []
    weight_points = []
    table = [header]
    #iterate through the days and store points
    start_day.step(start_day + days_back - 1, 1) {|day|
      result = 0
      health_tracker_entry = health_tracker_entry_list.detect {|element| element.date == day }
      if health_tracker_entry
        result = health_tracker_entry.send(method)
      end
      table << [day.strftime("%a"), result]
    }
    table
  end