[Rails] reflect_on_association method

Hi all, I am having trouble trying to use reflect_on_association
method with given the simplified model:

class Order < ActiveRecord::Base
belongs_to :contractor, :class_name => "BusinessUnit"
end

I expected the reflect_on_association method to return
associated_foreign_key "contractor_id" but it returns
"business_unit_id":

ruby-1.9.2-p0 >
Order.reflect_on_association(:contractor).association_foreign_key
=> "business_unit_id"

do I miss something?

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