与嵌入式文档建立一对多关系模型

• 在规范化数据模型中，地址文件包含对顾客文件的引用。 ```json // patron document { _id: “joe”, name: “Joe Bookreader” }

// address documents { patron_id: “joe”, // reference to patron document street: “123 Fake Street”, city: “Faketon”, state: “MA”, zip: “12345” }

{ patron_id: “joe”, street: “1 Some Other Street”, city: “Boston”, state: “MA”, zip: “12345” }

- 如果应用程序经常使用名称信息检索地址数据，则您的应用程序需要发出多个查询来解析引用。 更好的方案是将地址数据实体嵌入到顾客数据中
```json
{
   "_id": "joe",
   "name": "Joe Bookreader",
   "addresses": [
     {
       "street": "123 Fake Street",
       "city": "Faketon",
       "state": "MA",
       "zip": "12345"
     },
     {
       "street": "1 Some Other Street",
       "city": "Boston",
       "state": "MA",
       "zip": "12345"
     }
   ]
 }