Ok, so what I've got so far. I believe it's related to the association_proxy as (Using my application code, not the test case):
v = Version.query.first() v._classifiers = [Classifier.get_or_create(u"Foo")] db.session.commit() v._classifiers = [Classifier.get_or_create(u"Foo"), Classifier.get_or_create(u"Bar")] db.session.commit() Works, but if I then do: v.classifiers = [u"Foo"] db.session.commit() I get IntegrityError: (IntegrityError) duplicate key value violates unique constraint "idx_version_classifiers" So now i'm seeing what I can do with the test case you sent me to get it to exhibit the same behaviors :) On Friday, December 14, 2012 11:43:19 PM UTC-5, Michael Bayer wrote: > > its probably some subtlety to the data that's already loaded and how the > collection is being mutated - it's unlikely Flask has anything to do with > it. There may or may not be some less-than-ideal or buggy behavior in > association proxy, or it might be a premature flushing issue, but if you > can come up with how to reproduce that would be very helpful. > > > On Dec 14, 2012, at 11:38 PM, Donald Stufft wrote: > > Hrm. I'll see what I can do. Though looking at what you posted it works > for me with that too.. So the problem must either be with Flask-SQLAlchemy > or with my own app code. > > On Friday, December 14, 2012 11:30:57 PM UTC-5, Michael Bayer wrote: >> >> I've cobbled together a complete and simplified test case given your >> mapping and example code and I cannot reproduce with either 0.7 or 0.8 - >> the count of rows in the association table is one on the first commit, and >> two on the second. >> >> You need to adapt the attached test case into a full reproducing case so >> that the specific trigger is illustrated...thanks. >> >> > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/sqlalchemy/-/Xn2eZ0gifLgJ. > To post to this group, send email to sqlal...@googlegroups.com<javascript:> > . > To unsubscribe from this group, send email to > sqlalchemy+...@googlegroups.com <javascript:>. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. > > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/Hl2Ku45Qx2gJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
