gistfile1.rb

  def self.posts_and_comments_per_month_graph(number_of_months = 3)
    require 'gruff'
    g = Gruff::Line.new #Define a New Graph
    g.title = "Recent posts and comments per month" #Title for the Graph
    current = Time.current
    posts_data = []
    comments_data = []
    labels_data = {}
    number_of_months.downto(0) do |t|
        month = current.months_ago(t)
        posts_data    << Post.in_one_month(month).count
        comments_data << Comment.in_one_month(month).count
        labels_data[(number_of_months - t)] = month.strftime('%B')
    end

    g.data("Posts", posts_data)
    g.data("Comments", comments_data)
    g.labels = labels_data
    return g.to_blob
  end