Hi Jens, You also might find some background information here:
https://websauna.org/docs/narrative/modelling/occ.html Br, Mikko On 27 November 2017 at 11:00, <jens.troe...@gmail.com> wrote: > Hello, > > Looking at the SQLAlchemy cookie cutter > <https://github.com/Pylons/pyramid-cookiecutter-alchemy>, a request gets > its own transaction-backed db session, and on its way out a response > commits that transaction and closes the session. There are activation > <https://docs.pylonsproject.org/projects/pyramid_tm/en/latest/#adding-an-activation-hook> > and veto > <https://docs.pylonsproject.org/projects/pyramid_tm/en/latest/#adding-a-commit-veto-hook> > hooks too. > > I'm trying to understand the details behind the request/response ↔ db > session/transaction interaction. > > During ordinary operation, everything should work just fine and all > modifications to ORM objects during a view functions commit with the > response. But what happens when a transaction fails, for example because of > a CHECK constraint? > > How exactly are race conditions handled: suppose two requests to the same > endpoint at the same time, both create the same resource, one of which > fails (well, should!) to commit. When and how is that handled? > > Thank you for pointers and tips and hints in advance 🤓 > Jens > > -- > You received this message because you are subscribed to the Google Groups > "pylons-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to pylons-discuss+unsubscr...@googlegroups.com. > To post to this group, send email to pylons-discuss@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/pylons-discuss/2a39e5b2-d8fa-43be-891c-4b1cd48d465e% > 40googlegroups.com > <https://groups.google.com/d/msgid/pylons-discuss/2a39e5b2-d8fa-43be-891c-4b1cd48d465e%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- Mikko Ohtamaa http://opensourcehacker.com http://twitter.com/moo9000 -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to pylons-discuss+unsubscr...@googlegroups.com. To post to this group, send email to pylons-discuss@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/pylons-discuss/CAK8RCUscUcSc-SpJ-neW2BrU7eqKr3-2uTgGPbMDv0JR_dkM0Q%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
