如何从另一个模型预填充ActiveAdmin表单值？

Question

在以下代码中,如何使用另一个模型中的值将预填充的表单字段填充到ActiveAdmin表单中:

ActiveAdmin.register Person do

  index do
    column :forename
    column :surname
    column :code do |p|
      MyCode.find_by_person_id(p.id).code
    end
    column :updated_at
    default_actions
  end

  filter :forename
  filter :surname

  form do |f|
    f.inputs "Person" do
      f.input :forename
      f.input :surname
      # How to get a value here, e.g. MyCode.find_by_person_id(p.id).code as above
      #f.input :code, :input_html => { :value => value??? }, as: :hidden
    end
    f.actions
  end
end

Answer 1

正如nistvan上面评论的那样,has_one关系将相关对象提取到表单对象中,因此我的问题可以通过以下方式解决:

ActiveAdmin.register Person do

  index do
    column :forename
    column :surname
    column :code do |p|
      MyCode.find_by_person_id(p.id).code
    end
    column :updated_at
    default_actions
  end

  filter :forename
  filter :surname

  form do |f|
    f.inputs "Person" do
      f.input :forename
      f.input :surname
      f.input :code, :input_html => { :value => f.object.my_code.code }, as: :hidden
    end
    f.actions
  end
end