def ever_follow
      follow = []
      self.follow_history.each do |h|
        follow << h.split('_')[0].constantize.find(h.split('_')[1])
      end
      follow
    end
def ever_follow
      follow = []
      self.follow_history.each do |h|
        follow << h.split('_')[0].constantize.find(h.split('_')[1])
      end
      follow
    end
see user's follow history

 Example:
   >> @jim.ever_follow
   => [@ruby]