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Home/ Questions/Q 6325989
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Editorial Team
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Editorial Team
Asked: May 24, 20262026-05-24T16:59:51+00:00 2026-05-24T16:59:51+00:00

What is the closest thing to child_key from DataMapper in ActiveRecord? How would one

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What is the closest thing to child_key from DataMapper in ActiveRecord? How would one write this using ActiveRecord?

   belongs_to :something, :class_name => Foo, :child_key => [:something_id]
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  1. Editorial Team
    Editorial Team
    2026-05-24T16:59:52+00:00Added an answer on May 24, 2026 at 4:59 pm

    From what I read here :child_key is the foreign_key. In ActiveRecord you use :foreign_key.

       belongs_to :something, :class_name => 'Foo', :foreign_key => :something_id
    

    If I have misunderstood the purpose of child_key, please let me know.

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