> On 26 May 2015, at 09:16, Burak Arslan <burak.ars...@arskom.com.tr> wrote: > > same here but before passing the model instance from controller to view, > all instances are detached from session (via expunge()). this 1) > prevents a lot of unexpected db queries. 2) lets you recycle db > connections as soon as possible.
Oh, that's clever. One of the shortcomings of SQLAlchemy is that it makes it easy to produce a "query within a loop" anti-pattern through relation traversal. So far I prevented this by avoiding loading mapped objects as much as possible, instead loading only specific columns — with the nice side effect of reducing data transfer with the database. Now, thanks to you I realise I can prevent the anti-pattern with less code using Session.expunge_all(). -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.
