Ruby on rails 如何编写这个Rails作用域来检查中间表中的条件？

如何在用户上编写一个作用域，该作用域通过order返回与该用户关联的所有地址，其中order.paid==true

请注意，Order有多个具有不同名称的关联地址实例，但地址模型是相同的

class Order < ActiveRecord::Base
    belongs_to :shipping_address, :class_name => "Address", :foreign_key => :shipping_address_id
    belongs_to :billing_address, :class_name => "Address", :foreign_key => :billing_address_id
    belongs_to :user

    # the order table has a boolean 'paid' field
end

class Address < ActiveRecord::Base
    has_one :order
end

class User < ActiveRecord::Base
    has_many :orders
    # I want to create a scope here that returns addresses that belong to paid orders
end

---

如果我错了，请纠正我，但如果您添加了

 :has_many :addresses

对于类订单，我认为***它应该将与该用户相关的所有rails返回给您。我正在学习RubyonRails，如果这是错误的，请道歉