From: darius <noone@...>
Date: 2007-11-15T00:00:04+09:00
Subject: Re: why this rake db:migrate error

Phlip <phlip2005@gmail.com> wrote in
news:Qpmdnb7bS_bDGKvanZ2dnUVZ_qGknZ2d@adelphia.com... 


> 
> The best forum for Rails questions is Ruby-on-Rails-talk, at Google
> Groups. 
> 

thank you.  I'll check it out.

>>      def self.up
>>           Story.find(:all).each do |s|               
>>           s.update_attribute :votes_count, s.votes.length          
>>               end          
>>      end
> 
> In a database, never store a value that you could also get thru a
> query. That's a redundancy, and the best software always has the
> fewest redundancies of any type. I would erase :votes_count from all
> migrations, and just use votes.count.
> 

I know.  This was done to avoid a costly query.