ruby on rails - Implement Post ranking algorithm with Likes and Time difference -

how can rank posts likes , time difference(how old post) in ruby on rails. there suitable algorithm task.

here code algorithm

@rank = 0.00 s = post.likers(user).count order = math.log10([s.abs, 1].max) if s > 0     sign = 1   elsif s < 0      sign = -1 else     sign = 0 end td = (time.now - post.created_at) td2 = td.days * 86400 + td.seconds + ((1000000*(td.seconds)).to_f)/1000000 seconds = td2 - 1134028003 @rank = (sign * order + seconds / 45000).round(7) post.update_attributes(popularity: @rank) post.save! 

how reddit ranking algorithms work. if posts can liked, is, if number of likes positive number can simplify equation removing y.

update

ruby implementation of linked algo

def hot(ups, downs, date)   s = ups - downs   order = math::log([s.abs, 1].max, 10)   sign = if s > 0 1 elsif s < 0 -1 else 0 end   seconds = date.to_f - 1134028003   (sign * order + seconds / 45000).round(7) end 

note doesn't use time.now here. in implementation older post, smaller time difference (seconds) is, makes sense treat reward (to add it).

in implementation, seconds difference between , post creation time, should treat penalty, either subtracting seconds / 45000 or calculating td post.created_at - time.now, doesn't matter.

you don't need td2.

also, if want use implementation time.now, keep in mind have run script once in while update records in database.