Optimistic locking: revert the lock version when an update fails. Closes...
Optimistic locking: revert the lock version when an update fails. Closes #7840. Also return the number of affected rows instead of true. git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6843 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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