[Rails] Re: shared primary key (using the primary key as a foreign key for has_one association)

Just on more related question (if anyone has time to answer):

if i have set_primary_key 'person_id':

class Instructor < ActiveRecord::Base
set_primary_key 'person_id'
...
end

does it mean that writing

class Person < ActiveRecord::Base
has_one :instructor, :primary_key => 'person_id'
end

would be redundant?
What is the purpose of :primary_key in has_one options, if one uses
set_primary_key ?

Thanks.

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