To design a TreeViewer demo application, you must create your node class as your data model.
要设计TreeViewer演示应用程序，您必须创建节点类作为数据模型。
The first live demo is about Ruby2Ruby (6:28) and turns a Rails model class back into ruby code to see the magic Rails worked.
首先演示了一个关于Ruby2Ruby的例子(6：28)，然后把一个Rails模型类转变成ruby代码，由此看看神奇的Rails是如何运作的。
The demo app demonstrated this point by clearing the object model, then reloading it from the database.
示例程序将通过从对象模型中删除一个对象，再从数据库从新加载来解释这一点。
Once the demo app has reloaded the business model, it demonstrates that object identity has been preserved. In fact, there are two objects that get loaded twice.
一旦示例程序重新加载业务模型以后，它标识对象的标识已经被保存。
Once the demo app has reloaded the business model, it demonstrates that object identity has been preserved. In fact, there are two objects that get loaded twice.
一旦示例程序重新加载业务模型以后，它标识对象的标识已经被保存。
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