I am running into a confusing "can't operate on multiple entity groups in a
single transaction" case when I am, in fact, not accessing "multiple entity
groups". I think I understand what might be going on, but A) am not certain and
B) others might find it interesting, anyway.
What is happening is that I have a transaction that is operating over two
models: GoogleUser and Account. I get the GoogleUser instance associated with
the current e-mail address with get_by_key_name and then return gooser.account.
If I fail to find that GoogleUser, I add a new Account, and into the /same
entity group/ I add the GoogleUser in question.
For reference, here is the actual code of my transaction:
132 @staticmethod
133 def goi_account_by_primary_key_(user, hash, **kw):
134 gooser = GoogleUser.get_by_key_name(hash)
135 if gooser:
136 account = db.get(gooser.account)
137 keys = kw.keys()
138 for key in keys:
139 setattr(account, key, kw[key])
140 account.put()
141 else:
142 account = Account(**kw)
143 account.put()
144 gooser = GoogleUser(parent=account, key_name=hash,
user=user, account=account)
145 gooser.put()
146 return account
Note that moving the creation of the gooser above the creation of the account
(and swapping the parent/child relationship between them and making other
required code changes to temporarily support that) does work.
Why does this happen?
Currently my two theories are: A) the detection code is incorrect, and is
making assumptions about "same model", and B) entities that don't exist yet are
only considered in the same entity group as that entity itself, so even though
I'm going to create that entity later into the same entity group, I can't put a
different object first as the data store can't tell the difference. I am
guessing that B is correct, in which case maybe someone else working on this
same problem will find this post and be helped by it. If it isn't B, then maybe
someone would be kind enough to tell me what the problem actually is ;P.
-J
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