ruby on rails - How can i get a percentage of how many users favorited a post -

how can percentage of how many users favorited post? 80% of users favorite first post. using gem called markable.

in posts controller can favorite post this.

class postscontroller < applicationcontroller  def favorite   @post = post.friendly.find(params[:id])   current_user.mark_as_favorite @post   redirect_to @post  end end 

i can see users have favorited post this

@post = post.first << test post @post.users_have_marked_as_favorite << [user1, user2] @post.users_have_marked_as_favorite.count << 2 

below post , user models

class post < activerecord::base  extend friendlyid  friendly_id :title, use: :slugged  # markable_as :favorite gives me option favorite  markable_as :favorite end  class user < activerecord::base  acts_as_marker end 

this calculate percentage , round have 2 decimal numbers

class post < activerecord::base   def favored_percentage     (users_have_marked_as_favorite.count * 100 / user.count).round(2)   end end