google-app-engine:我如何在另一个类中拥有一个对象列表作为属性

Question

如何在google appengine db model中实现这一点

from google.appengine.ext import db
Class Car(db.Model):
    name=db.StringProperty()
    model=db.StringProperty()
    mileage=db.IntegerProperty()
Class Person(db.Model):
    name=db.StringProperty()
    age=db.IntegerProperty()
    cars=db.ListProperty(Car) # How can I have cars object for person containing list of Car Objects? 

谢谢

Answer 1

查看参考文档http://code.google.com/appengine/docs/python/datastore/datamodeling.html#References

反过来也可以，类Car会有

person = db.ReferenceProperty(Person, collection_name="cars")

将使属性cars在Person中可用。