I think that this functionality is more for a ORM than the DAL. There are certain features that the an ORM could actually work a layer above the DAL, such as table Auditing, django-like query syntax, many-to-many mapping/handling. Probably more.
But I always vote to keep the DAL minimal, and just that, an abstraction layer. -Thadeus On Sun, Mar 21, 2010 at 5:48 PM, Richard <richar...@gmail.com> wrote: > would it be sensible for the web2py DAL to handle this automatically? > > > > On Mar 22, 2:55 am, "mr.freeze" <nat...@freezable.com> wrote: >> Something like this?: >> >> existing = db(db.person.id==desired_id).select().first() >> incoming = [f for f in request.vars.keys() if f in >> db.person.fields] >> changes = dict([(f,request.vars[f]) for f in incoming if >> existing[f] != request.vars[f] ]) >> if changes: existing.update_record(**changes) >> >> On Mar 21, 10:22 am, Matthew <matthew.g.nor...@gmail.com> wrote: >> >> > Thank you for your quick reply. >> >> > In my example, I provided only field for simplicity. In reality, you >> > could have 20 fields to check against. Would I have to check all of >> > them manually, or is this a cleaner way? >> >> > Thanks again! >> >> > On Mar 21, 10:45 am, "mr.freeze" <nat...@freezable.com> wrote: >> >> > > existing = db(db.person.id==desired_id).select().first() >> > > if existing and existing.name != request.vars.name: >> > > existing.update_record(name=request.vars.name) >> >> > > On Mar 21, 9:38 am, Matthew <matthew.g.nor...@gmail.com> wrote: >> >> > > > Is there a clean way to update a record only if it is different than >> > > > the proposed changes? >> >> > > > For example, I have a person in the table 'person' whose name is >> > > > 'Pete'. To update his name: >> >> > > > desired_id = 5 >> > > > db(db.person.id == desired_id).update(name='Pete') >> >> > > > Update is executed, even though his name did not change. What's the >> > > > cleanest way to not do the update if the record's fields have not >> > > > changed? >> >> > > > Thanks, >> > > > Matthew > > -- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To post to this group, send email to web...@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. > > -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web...@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.
