Suppose you have:
db.define_table('membership',
'user_id': db.auth_user,
'things': 'list: reference thing'
)
db.define_table('thing', ...)
The following does not work:
db(db.membership.user_id = 2).update(things=list_add(db.membership.things,
3))
where
def list_add(l, e):
if e in l:
return l
else:
return l + [e]
The problem seems to be that the db.membership.things field that is passed
to list_add is, somehow, NOT a list.
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