[web2py] create new record and update status simultaneously

[黄祥]

hi,

is it possible to create new record and update status simultaneously?
e.g. update()
def __add_2():
    form = crud.create(db.booking, next = URL(request.application,
request.controller, 'index'), onaccept = db.room(db.room.id ==
request.vars.room_id).update(status = 'Booked'))
    return dict(form = form)

an error occured said:
AttributeError: 'NoneType' object has no attribute 'update'

i've tried another (update_record):
def __add_2():
    form = crud.create(db.booking, next = URL(request.application,
request.controller, 'index'), onaccept = db.room(db.room.id ==
request.vars.room_id).update_record(status = 'Booked'))
    return dict(form = form)

an error occured said:
AttributeError: 'NoneType' object has no attribute 'update_record'

i know i was wrong, but i'm not understand where is my fault code,
could there anybody give me a pointer and shows me how to fix it?

thank you so much before