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I''m a newbie for RoR, and also web dev and database design (but been doing C++ apps for years). I''m trying to learn to use RoR and mySQL by doing a toy project. What I''m trying to do is a web base reservation app for lab machines. I have a number of machines, each can be reserved on hourly basis. So I set up a the following tables: users, machine, reservations. The