Now that Rails uses Ruby to express database structure (migrations), it seems silly to me that we can’t just express that right in the model classes. Something like this:
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Doing this would not only make models more cohesive, but it would make it easier to specify a lot about models without ever touching the database.
We’d need a means of discovering necessary migrations on the fly, and that could get very tricky very quickly, but I think it’s worth exploring.