thoughtbot/factory_girl — pull request #383 by joshuaclayton (2012-05-18 20:33:14+00:00)
Title: Optionally don't duplicate assignment in initialize_with

By setting:

FactoryGirl.duplicate_attribute_assignment_from_initialize_with = false

This turns off duplicate assignment of attributes accessed from
initialize_with. This means any attributes accessed from the factory and
assigned in the initialize_with block won't be subsequently set after
the object has been instantiated.

This will be the default functionality in 4.0.