* Continued work on improving post view templates

* Added statistics-based estimator for related tag calculator
* Fleshed out IpBan class based on changes to Danbooru 1.xx

app/models/comment_vote.rb

@@ -1,10 +1,21 @@
 class CommentVote < ActiveRecord::Base
   class Error < Exception ; end
 
+  attr_accessor :is_positive
+  validates_uniqueness_of :ip_addr, :scope => :comment_id
   belongs_to :comment
   belongs_to :user
+  after_save :update_comment_score
   
   def self.prune!
     destroy_all(["created_at < ?", 14.days.ago])
   end
+  
+  def update_comment_score
+    if is_positive
+      comment.increment!(:score)
+    else
+      comment.decrement!(:score)
+    end
+  end
 end