It looks like in a DAL callback, the original values of the record are not available? So I would need to do read the old row from the database to get the old values of the row to determine if the value of a field has changed? Thanks.
On Monday, October 7, 2013 10:35:25 AM UTC-10, Niphlod wrote: > > why don't you use callbacks ? they are the most useful feature in DAL's in > my POV. > > http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#before-and-after-callbacks > > On Monday, October 7, 2013 8:55:29 PM UTC+2, James Thompson wrote: >> >> I thought default=request.now and update=request.net reflect changes in >> the record as a whole? >> I'm looking for something that only updates when the value of the status >> field changes. >> >> On Monday, October 7, 2013 3:31:33 AM UTC-10, 黄祥 wrote: >>> >>> i think you can achieve it with default. >>> e.g. >>> Field('f_status_change_dt', type='datetime', >>> label=T('Status Change Dt')*, default=request.now*) >>> >>> or if you set auth.signature or record_versioning, web2py automatically >>> do that for you. >>> >>> ref: >>> >>> http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer#Record-versioning >>> >>> http://web2py.com/books/default/chapter/29/09/access-control#Record-versioning >>> >>> best regards, >>> stifan >>> >> -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
