Ruby on Rails

Hi, I was reading the docs for primary key on postgresql  and I saw that there was a way to add a custom stored procedure that returns a UUID. There is a test case as well that uses a custom uuid generator https://github.com/rails/rails/blob/650ea5e5cf50d8a7242499463cf1762922d330a8/activerecord/test/cases/adapters/postgresql/uuid_test.rb#L193 but I wasn't sure how to to implement this myself. 

Like in the test case where do I place 'my_uuid_generator()' and how to implement it in my rails application?

Thanks.

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