db.define_table('x',Field('number','integer'))
if db(db.x).isempty(): [db.x.insert(number=i) for i in
range(10)]
class
MyVirtualFields(object):
# normal virtual field (backward compatible,
discouraged)
def normal_shift(self): return self.x.number
+1
# lazy virtual field (because of
@staticmethod)
@staticmethod
def lazy_shift(instance,row,delta=4): return row.x.number
+delta
db.x.virtualfields.append(MyVirtualFields())
for row in
db(db.x).select():
print row.number, row.normal_shift,
row.lazy_shift(delta=7)
I made a change. Notice that @staticmethod virtualfields (aka lazy
virtualfields) now take two arguments (the instance of the class that
declares the virtualfield and the row obect. Also they are faster that
normal "old style" virtual fields and faster if there are no virtual
fields.
I am still not sure about this.... let me know what you think.
Massimo
On Aug 20, 3:59 am, Massimo Di Pierro <massimo.dipie...@gmail.com>
wrote:
> I am still uneasy about this and I may still change the syntax about
> the lazy virtualfields....
>
> On Aug 19, 7:32 pm, rochacbruno <rochacbr...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Very good! Thank you
