ActiveRecordtoSDB is just a simple wrapper class which implements some extra functionality on top of RightAWS ActiveSDB.
The goal is to make it easier to transition the appropriate models of a project from a traditional RDBMS to SimpleDB, by implementing some of the most used functionality of ActiveRecord.
For more information, check out the README.
To download, go to ActiveRecordtoSDB on RubyForge.
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