prim 0.0.8
With Prim it's easy to add a primary member to any one-to-many or many-to-many association. Just add a short configuration to a model, generate and run a migration, and you're all set.
Gemfile:
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instalar:
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Runtime Dependencies (2):
activerecord
~> 3.2.0
activesupport
~> 3.2.0