Rank Links according to number of parameters

params.txt

Upvote number
Comments recieved for a link
Share count
user rank
Recency
Follower count of category (eg: gaming)

Visiter - Upvote ratio (later)


The equation which I used to find rank is

points*2 + log(comment_weight)*2 +log(share_count) + (log(user_weight) +log(category_weight))/5
_______________________________________________________________________________
                                            log(age)**2



This will return a fraction value mostly between 0 to 100 and will assign to each post (links)

rank.rb

incude Math
class Rank
  attr_accessor :link

  def initialize(link)
    @link = link
  end

  #where ranking occurs
  def rank_link
     ((points*2) + (log(comment_weight)*2) + log(share_count) + (log(user_weight) + log(category_weight))/5 )/log(age)**2
  end

  private
  #Return points
  def points
    @link.ups - @link.down
  end

  #Comment
  def comment_weight
    @link.comments.count
  end

  #To get epoch seconds of created at - Recency matters
  def epoch_second
    @link.created_at.to_i
  end
  def age
    Time.now.to_i - epoch_second
  end

  def share_count
    @link.shares.count
  end

  #Assume user have a ranking system which results weight
  #More post count, Most upvoted post, Most commented post means most weighted user
  def user_weight
    @link.user.weight_score
  end

  #Each link is belongs to a category
  #Category has weight according to number of users following.
  def category_weight
    @link.category.weight_score
  end
end