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Home/ Questions/Q 6052829
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T07:58:17+00:00 2026-05-23T07:58:17+00:00

I have a child model which accepts_nested_attributes_for another model in a has_one / belongs_to

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I have a child model which accepts_nested_attributes_for another model in a has_one / belongs_to relationship. I am trying to configure the activescaffold controller like this:

config.create.columns = [:name, :birthdate, :device_attributes]

But it just throws this error:

undefined method `device_attributes' for #<Child:0xc103e28>

Note: I have overridden the default create_form with a custom implementation.

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  1. Editorial Team
    Editorial Team
    2026-05-23T07:58:18+00:00Added an answer on May 23, 2026 at 7:58 am

    I found a way to make it works. I just added this to the activescaffold controller:

      def before_create_save(record)
        record.device_attributes = params[:record][:device_attributes]
      end
    
      def before_update_save(record)
        record.device_attributes = params[:record][:device_attributes]
      end
    

    It’s not the cleaner way to do it, but i didn’t find other way.

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