In your module definition you should use a property class, that is
instead of:
class Tag(db.Model):
transaction = db.Key(encoded=None)
...
you should use:
class Tag(db.Model):
transaction = db.StringProperty(required=True)
...
...if you want to store the string representation of the key. Or:
class Tag(db.Model):
transaction = db.ReferenceProperty(Transaction, required=True)
...
...if you want to store the key itself.
In the former case you should use this code:
tag = Tag(transaction=str(transaction.key()), ...)
tag.put()
# tag.transaction is a string, need to construct the key from it
tr_key = db.Key(tag.transaction)
transaction = Transaction.get(tr_key)
And in the latter case:
tag = Tag(transaction=transaction, ...)
tag.put()
# tag.transaction is automatically de-referenced
transaction = tag.transaction
Hope this helps.
Alex
--
www.muspy.com
On Dec 23, 9:09 am, Shay Ben Dov <shay.ben...@gmail.com> wrote:
> Hi this is the issue
>
> I have a Transaction model
>
> I do:
> transaction=Transaction(....)
> transaction.put()
>
> tr_key = str(transaction.key())
>
> I want to store it in a second mode
>
> class Tag(db.Model):
>
> transaction = db.Key(encoded=None)
> tag = db.StringProperty(required=True)
> user = db.UserProperty(required=True)
>
> I do:
>
> tag = Tag(transaction=tr_key,....)
> tag.put()
>
> later on in the application I retrieve the tag entity and I want to
> get the transaction back
>
> I do:
> tr_key = tag.transaction
> transaction = Transaction.get(tr_key)
>
> and I get an error message:
> BadKeyError: Key datastore_types.Key.from_path(_app=u'') is not
> complete.
>
> Every help or example is very appreciated.
>
> Thanks,
>
> Shay
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