同一实体的数据存储区父级子级

Question

I would like to have a datastore entity with a reference property back to the same entity. For example:

class Person(db.Model):
    name = db.StringProperty(),
    parent = db.ReferenceProperty(Person,
            collection_name='parents')

So a person has a parent who is also a person (hopefully). This throws a NameError: name 'Person' is not defined exception. This example would only allow a person to have one parent, but it is just an example, not exactly what I am trying to model.

What is the best way to model this type of relationship with google app engine datastore?

Answer 1

采用：

parent = db.SelfReferenceProperty(collection_name='parents')