Thanks for the reply @kristian, unfortunately your solution requires the removal of one of the models keys which alters it from the desired schema (a composite key of Province and Municipality, which would not allow duplicate Municipality names in one Province, but would allow duplicate Municipality names in different Provinces). To verify this I just tried entering two entries for different Provinces, but with the same Municipality name, and I received a DataObjects::IntegrityError due to the :name key conflict.
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