[web2py] one form for multiple tables - updating record

[niknok]

I've read the section about "one form for multiple tables"  and
following the example created my function that updates four tables: 

def register():
    form=SQLFORM.factory(db.person, db.affiliation, db.address, db.card)
    if form.accepts(request.vars):
        id = db.person.insert(**db.person._filter_fields(form.vars))
        form.vars.person=id
        id = db.affiliation.insert(**db.affiliation._filter_fields(form.vars))
        id = db.address.insert(**db.address._filter_fields(form.vars))
        id = db.card.insert(**db.card._filter_fields(form.vars))
    return dict(form=form)


That works fine. Now, following the book convention, I tried to display
the same record set but it produces an error:


def display():
    record = db.person(request.args(0)) 
    form=SQLFORM.factory(db.person, db.affiliation, db.address, db.card, record)

    if form.accepts(request.vars, session):
        record.update_record(**dict(form.vars))
    
    return dict(form=form)    



Traceback (most recent call last):
  File "/home/rwn/Projects/web2py/gluon/restricted.py", line 192, in restricted
    exec ccode in environment
  File 
"/home/rwn/Projects/web2py/applications/g_bender/controllers/default.py", line 
132, in <module>
  File "/home/rwn/Projects/web2py/gluon/globals.py", line 137, in <lambda>
    self._caller = lambda f: f()
  File 
"/home/rwn/Projects/web2py/applications/g_bender/controllers/default.py", line 
66, in update
    form=SQLFORM.factory(db.person, db.affiliation, db.address, db.card, 
record=record)
  File "/home/rwn/Projects/web2py/gluon/sqlhtml.py", line 1226, in factory
    return SQLFORM(DAL(None).define_table(table_name, *fields), **attributes)
  File "/home/rwn/Projects/web2py/gluon/sqlhtml.py", line 772, in __init__
    default = record[fieldname]
  File "/home/rwn/Projects/web2py/gluon/dal.py", line 3701, in __getitem__
    return dict.__getitem__(self, key)
KeyError: 'organization'


I think the error is because  I'm only passing a record from db.person. 

So how do I actually retrieve the same record set I entered using the
technique presented in "one form for multiple tables"? I couldn't find a
relevant example to follow in the book.

Thanks.