您将使用动态关系 来基于主键对数据进行关联。
You use a dynamic relationship to correlate data based on primary keys.
小部件可以触发事件，提供描述相关联的事件类型的元数据，从而支持在页面上显示动态内容。
A widget can trigger events and metadata that describes event types associated with it, allowing for dynamic content on the page.
Active Record将类和表关联起来，并按照数据库中的每一列给每个类动态地添加一个属性。
Active Record associates a class with a table and dynamically adds an attribute to each class for every column in the database.
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