Thanks, Massimo. I think I understand what I have to do, now. In the onvalidation script I have to retrieve the db and then add or modify the record that's represented by the form data. Then I can process the information to determine whether the form is to be accepted. It'll take a little doing, but shouldn't be too hard.
On Jun 6, 7:52 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > accpets takes two arguments > > onvalidation=lambda form: None > onaccept=lambda form: None > > onvalidation is run after validation before insert/update/delete > onaccept is done after insert/update/delete before redirection > > It it technically possible to make onaccept point to a function that > does some checks and then eventuall calls db.rollback(). I > definitively advice against that. I think you constraints must be > checked before insert/update/delete. That is what onvalidation is for. > > You validation takes the form and if you want to block the subsequent > insert/update/delete simply add an error to form.errors explaining the > problem. Example: > > def algorithm(form): > if form.vars.a!=form.vars.b: > form.errors.b='should be the same as a" > > form.accepts(request.vars,onvalidation=lambda form: algorithm(form)) > > On Jun 6, 5:52 pm, weheh <richard_gor...@verizon.net> wrote: > > > > > I'm doing the following: > > if form.accepts(request.vars,session,onvalidation=my_val): > > session.flash='success' > > redirect(URL(r=request,f='newpage')) > > elif form.errors: > > response.flash='error' > > > I'm wondering if the data are committed to the db before my_val gets > > executed or only afterwards? In other words, if my_val does a db > > query, will it find already in the db the data from the form? > > > If no, what if the form acceptance depends on checking the interaction > > between the data already in the db and data on the form? > > > In essence, I want to write the form data to the db, run an algo, then > > decide whether to rollback the db. I think I'm really close to the > > answer, but I'm not sure what the right way is to do this. Anyone have > > a simple example?- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py Web Framework" group. To post to this group, send email to web2py@googlegroups.com To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
