Rails - Sep 2006 - What is peformance gain of using counter_cache?

Hi,

I am wondering what is the peformance gain for using counter_cache?

Simple counter_cache setup:

class Comment
  belongs_to :post, :counter_cache => true
end


class Post
  has_many :commments
end

So, the ''post'' table will have a column called
''comments_count''.


I''m trying to see if using counter_cache is worth it given the extra 
table or even column and extra inserts.

Thanks.

Truong-An.



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counter_cache can make a big performance difference when you have a lot 
of rows.

Joe

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