activeadmin 형식에서base 오류 보이기

class Article < ApplicationRecord
  validate :custom_validate

  def custom_validate
    if condition
      errors.add(:base, 'XXXなのでダメです。')
    end
  end
end

ActiveAdmin.register Article do

  ...

  form do |f|
    f.inputs do
      f.input :title
      f.input :text
    end
    f.actions
  end
  # => このままだと:baseエラーが表示されない...
end

결론

ActiveAdmin.register Article do

  ...

  form do |f|
    f.semantic_errors
    f.inputs do
      f.input :title
      f.input :text
    end
    f.actions
  end
end

참고 자료