nutrition_data.rb

ActiveAdmin.register NutritionData do
  menu false

  form do |f|
    f.inputs "Details" do
      f.input :item_id, :as => :hidden
      f.input :header, :input_html => {:rows => 5}
      f.input :serving, :input_html => {:rows => 5}
      f.input :calories
      f.input :calories_from_fat
    end

    f.has_many :nutrition_items do |nutrition_item|
      if nutrition_item.object.new_record?
        nutrition_item.input :title
        nutrition_item.input :value
      else
        nutrition_item.input :title
        nutrition_item.input :value
        nutrition_item.input :_destroy, :as => :boolean, :required => false, :label => 'Remove Nutrition Item'
      end

      nutrition_item.has_many :child_nutrition_items do |child_nutrition_item|
        if child_nutrition_item.object.new_record?
          child_nutrition_item.input :title
          child_nutrition_item.input :value
        else
          child_nutrition_item.input :title
          child_nutrition_item.input :value
          child_nutrition_item.input :_destroy, :as => :boolean, :required => false, :label => 'Remove Nutrition Child Item'
        end
      end
    end

    f.buttons
  end

  controller do
    def create_with_redirect_to_item
      create_without_redirect_to_item do |success, failure|
        if success.nil? != nil
          redirect_to admin_item_url(@nutrition_data.item)
          return
        end
      end
    end

    alias_method_chain :create, :redirect_to_item


    def update_with_redirect_to_item
      update_without_redirect_to_item do |success, failure|
        if success.nil? != nil
          redirect_to admin_item_url(@nutrition_data.item)
          return
        end
      end
    end

    alias_method_chain :update, :redirect_to_item

    def destroy_with_redirect_to_item
      destroy_without_redirect_to_item do |success, failure|
        if success
          redirect_to admin_item_url(@nutrition_data.item)
          return
        end
      end
    end

    alias_method_chain :destroy, :redirect_to_item
  end
end