# Active Record 数据库连接：底层适配，约定、配置

* Model Schema
* Naming Conventions
* Schema Conventions
* Timestamps
* Core
* ~~Attribute~~

和属性的类型转换有关，在 Attribute Set 里会用到。尽管 Attribute Set 也属于底层。

* ~~Attribute Set~~
* ~~Attribute Decorators~~

相对而言较底层，使用 Rails 的话，一般不会直接用到的它们：

* Connection Handling
* Serialization
* Migration DatabaseTasks
* Statement Cache
* ~~Explain~~
* ~~Explain Registry~~
* ~~Explain Subscriber~~
* ~~Query Cache~~
* ~~Result~~
* ~~Runtime Registry~~
* ~~Sanitization~~
* ~~Legacy Yaml Adapter~~
