improved search methods

app/models/comment_vote.rb

@@ -14,6 +14,17 @@ class CommentVote < ActiveRecord::Base
     destroy_all("created_at < ?", 14.days.ago)
   end
   
+  def self.search(params)
+    q = scoped
+    return q if params.blank?
+    
+    if params[:comment_id]
+      q = q.where("comment_id = ?", params[:comment_id].to_i)
+    end
+    
+    q
+  end
+  
   def validate_user_can_vote
     if !user.can_comment_vote?
       errors.add :user, "can not comment vote"