[Rails] Duplicating Constraints

[David Heinemeier Hansson]

> Re-specifying constraints in ruby that are already specified in the
> database is code duplication.

Which is why my approach (and recommendation) is not to specify it in 
the database, but only in Ruby code. I understand that this is 
considered blasphemy among some database people, though.

And this advice only applies to an Application Database design -- not 
Integration Databases. As do all of my opinions on the division between 
database and object-model.
--
David Heinemeier Hansson,
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