Care to explain? I haven't hear about it. | Hacker News

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		pdelgallego on May 5, 2011 \| parent \| context \| favorite \| on: Rails 3.1 beta 1 released Care to explain? I haven't hear about it.

ctide on May 5, 2011 | [–]

http://edgerails.info/articles/what-s-new-in-edge-rails/2011... is a good synopsis of IdentityMap.

tomeric on May 5, 2011 | [–]

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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