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A comment on Rails 3.1 beta 1 released. Parent comment

Re:Rails 3.1 beta 1 released by pdelgallego on Thursday May 05, 2011 @03:26AM (#2516519)
Care to explain? I haven't hear about it.
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Re:Rails 3.1 beta 1 released by tomeric on Thursday May 05, 2011 @03:39AM (#2516542)
The IdentityMap makes sure that there is only 1 ActiveRecord instance for a given row in the database.

This basically means that calling Article.find(3) and Comment.where(:article_id => 3).first.article both return the same instance.

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Re:Rails 3.1 beta 1 released by ctide on Thursday May 05, 2011 @03:56AM (#2516565)
http://edgerails.info/articles/what-s-new-in-edge-rails/2011... is a good synopsis of IdentityMap.
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