On Jan 28, 11:06 pm, Richard <richar...@gmail.com> wrote: > thanks that's much neater. > > > does not do what you think it does. > > can you explain? It worked for my test cases...
You were right. It just looked wrong at a quick look. Sorry I would have looked in more detail. > > record = db(logic).select(table['id']).first() > > I noticed you removed the ID selection part - is there any efficiency > gained in just selecting the ID? yes, it should be faster in jsut selecting the id. It will be even faster if you do db(logic).select(table['id'],limitby=(0,1)).first() or db(logic).count() since you do not need the record. You just need to know if it exists. > > Richard > > On Jan 29, 12:06 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > This > > > logic = None > > for field, value in fields.items(): > > e = table[field] == value > > logic = e if logic is None else logic & e > > record = db(logic).select(table['id']).first() > > > does not do what you think it does. > > > I think you want: > > > logic=reduce(lambda a,b:a&b,[table[k]==fields[k] for k in fields]) > > record = db(logic).select().first() > > > On Jan 28, 6:24 am, Richard <richar...@gmail.com> wrote: > > > > I want to get the ID of a record with certain fields, and create it if > > > not already existing. Is there a shortcut for this common operation? > > > In Django it is called "get_or_create()" > > > > Also, is there a shortcut for update_or_create()? > > > > Thanks, > > > Richard > > -- 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.
