[google-appengine] delete or rename a property?

[Toto]

I am using ndb
I need to sub-class a master class. (I don't have control over the super 
class)
Is it possible to delete / rename a property in the super class in the the 
sub-class?

If not, is there a write cost for non-required property?
Can I select which property I want to display in the admin interface?

Regards



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[google-appengine] 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


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