active_admin_example models

gistfile1.rb

class User < ActiveRecord::Base
  has_many :orders
  attr_accessible :first_name, :last_name
end

class Order < ActiveRecord::Base
  belongs_to :user
  has_many :order_items
  attr_accessible :total, :user_id
end

class OrderItem < ActiveRecord::Base
  belongs_to :order
  attr_accessible :order_id, :product_id, :quantity
end