GAE db.ReferenceProperty 自引用

发布于 2024-10-10 05:25:15 字数 877 浏览 4 评论 0原文

是否可以通过 db.ReferenceProperty 引用 self，是否可以构造一个列表？

例如，我有一个 User 类，我想要为他/她的朋友提供一个引用 User 类的属性？

我目前正在使用Python。

编辑：

所以如果我有这个类：

class Node(db.Model):
    name = db.StringProperty(required=True)
    neighbour = db.SelfReferenceProperty(collection_name="neighbours")

node1 = Node(name="node1")
node2 = Node(name="node2")
node1.neighbour = node2
node2.neighbour = node1
node1.put()
node2.put()

我可以通过 node1.neighbours 和 node2.neighbours 访问其他节点的列表吗？

或者我应该这样做：

class Node(db.Model):
    name = db.StringProperty(required=True)
    neighbour = db.ListProperty(Node)

node1 = Node(name="node1")
node2 = Node(name="node2")
node1.node = [node2]
node2.neighbour = [node1]
node1.put()
node2.put()

另外，我如何能够添加/删除/修改上面两个示例中的邻居列表？

谢谢

原文

Is it possible to reference self via the db.ReferenceProperty, and is it possible to construct a list?

For example I have a class for User and I want a property for his/her friends that references the User class?

I'm currently using Python.

Edit:

So if I have this class:

class Node(db.Model):
    name = db.StringProperty(required=True)
    neighbour = db.SelfReferenceProperty(collection_name="neighbours")

node1 = Node(name="node1")
node2 = Node(name="node2")
node1.neighbour = node2
node2.neighbour = node1
node1.put()
node2.put()

can I access a list of other nodes via node1.neighbours and node2.neighbours?

Or should I do this:

class Node(db.Model):
    name = db.StringProperty(required=True)
    neighbour = db.ListProperty(Node)

node1 = Node(name="node1")
node2 = Node(name="node2")
node1.node = [node2]
node2.neighbour = [node1]
node1.put()
node2.put()

Also how would I be able to add/delete/modify the list of neighbours in both examples above?

Thanks

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