Ruby on Rails

This is what I have

belongs_to :user, :counter_cache => true
belongs_to :vote_item, :counter_cache => true
belongs_to :vote_topic, :counter_cache => true

##User model

def vote_for(vid, vtid)
Vote.create(:user_id => self.id, :vote_item_id =>
vid, :vote_topic_id => vtid)
end

def cancel_vote(vid, vtid)
Vote.find(:first, :select => "id", :conditions =>
['vote_item_id = ? AND vote_topic_id = ? AND user_id = ?', vid, vtid,
self.id]).destroy
end

When a vote is created the votes_count in VoteItem and VoteTopic are
updated correctly. But when a vote is destroyed or cancelled the
counter is not decremented.

Please help

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