> Wouldn't it create INNER JOIN query on a_type table? AFAIR it would and it's
> a bit overhead.
> But surely it is a better solution than mine one, thanks for that.
Well, in that case, I think your problem is that your AType PK isn't
the mnemo field, but some integer field, so type_id is integer, not
string.
Try defining it as
mnemo = models.CharField(u'Mnemocode', max_length=31, null=True,
unique=True, primary_key=True)
but I'm not sure if this is the behavior you want
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