Mongoid中class_name和inverse_class_name有什么区别？

Question

Mongoid中class_name和inverse_class_name有什么区别？

Answer 1

此代码将让您清楚地了解差异：

class Order
  include Mongoid::Document
  embeds_many :items
end

class Item
  include Mongoid::Document
  embedded_in :order
end

item = Item.new
order = Order.create({ items: [ item ] })

puts order.items.metadata.class_name
# => Item

puts order.items.metadata.inverse_class_name
# => Order

也就是说，class_name是关系的referrer类，而inverse_class_name是关系的裁判类。