如何在GAE中获得上级实体？

Question

I create a "Post" entity via the following line:

    post = Post(date=datetime.now(),title=postInfo['title'],body=postInfo['body'],postid=postIdForTitle(postInfo['title']),parent=author)

where author is a datastore entity.

How do I access a "post"'s parent? I tried doing post.parent but apparently "parent" is a function. I was unable to find this in the docs.

Answer 1

You can get a key of a parent entity from the key of your child entity. Look at the key Class:

https://developers.google.com/appengine/docs/python/datastore/keyclass#Key_parent

Answer 2

Try this:

key_name = postIdForTitle(postInfo['title'])
parent = post.get_by_key_name(key_name).parent