[Rails] ActiveRecord and data integrity

[David Heinemeier Hansson]

> Is there anything in ActiveRecord that selects data and then runs 
> inserts or updates based on information retrieved during select?

Nothing that isn't run within a transaction (if you should find 
otherwise, it's a bug to report). If you run MyISAM, you've chosen not 
to care about such things and will have to do LOCK TABLE and friends 
manually.
--
David Heinemeier Hansson,
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