Ruby on Rails

I'm newbie to RoR, can anybody explain what is the purpose of
":with_disabled => true" in

belongs_to :person, :class_name => 'Party', :foreign_key => 'person_id',
:with_disabled => true

Because I'm getting the following error

Unknown key(s): with_disabled

FYI: I couldnt find any documenttion for it.

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