db to ndb migration ... issue with collection_name

[Toto]

In my previous GAE app, I had something like a blog (Post and related Comment)

Posts and Comments where 2 different models such as

class Post(db.Model):

    headline = db.StringProperty(required = True)

    content = db.TextProperty(required = True)   

   

class Comment(db.Model):

    """ Comment object with many-to-one relationship """

    content = db.TextProperty(required = True) 

    post = db.ReferenceProperty(Post, collection_name='comment_set')

Now with db, thanks to the collection_name, I could easily find the comments referring to a post ( aka back reference) using post.comment_set

How are now back references handled in ndb?

Is there a preferred method?

Regards

[Gianni]

Hi,

Guido explained very clearly how to do here.

Just add a property to the Post class 

    @property

    def comments(self):

        return Comment.query(Comment.post == self.key)

-- Gianni

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