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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