Hi,
The method that you are using currently works, but there is no guarantee
that it will continue to work in the future - by which I mean that the
current API design only specifies that ReferenceProperty is fetched from the
datastore when referenced.
We've had requests that there be a way to expose only the key of the
reference, and not the actual entity, and I think this is a valid feature
request. I don't believe it's filed in the tracker, so you should do that,
and those interested in this feature should star the issue.
-Marzia
On Mon, Sep 29, 2008 at 6:23 PM, Andy Freeman <[EMAIL PROTECTED]> wrote:
>
> Is there an approved way to copy a ReferenceProperty from one entity
> to another without fetching the referred to entity from the datastore?
>
> In other words,
>
> class C(db.Model):
> ...
>
> class A(db.Model):
> C = db.ReferenceProperty(reference_class=C)
>
> class B(db.Model):
> C = db.ReferenceProperty(reference_class=C)
>
> a = {some query}
> b = B()
> # I would like to do the next assignment without retrieving the
> relevant entity
> # from the data store.
> b.C = a.C
>
> Yes, I know that a._C.id() can be used to read the id, but that
> doesn't seem to be part of the documented interface.
>
> >
>
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