I can't find anything related to this at:
http://www.sqlalchemy.org/docs/05/sqlalchemy_orm.html
My code is :
class Warehouse(object):
def __init__(self,id,construction_id,area_total,area_storage):
self.id = id
self.construction_id = construction_id
self.area_total = area_total
self.area_storage = area_storage
def __repr__(self):
return "%s" % self.id
class AreaProxy(object):
def __getattr__(self, key):
return getattr(Warehouse, "area_" + key)
area = AreaProxy()
And this isn't working becouse:
Warehouse.area.total
returns
.area_total
Did i implement this wrong?
On 13 Paź, 21:09, Michael Bayer <[EMAIL PROTECTED]> wrote:
> On Oct 13, 2008, at 2:50 PM, g00fy wrote:
>
>
>
> > How this Proxy object is going to work exacly?
> > Will that generate extra Sql or what?
> > I assume that I should just change __getattr__() to desired and return
> > Warehouse.key ? or warehouse_table.c.key?
>
> the proxy, which actually should read:
>
> class Proxy(object):
> def __getattr__(self, key):
> return getattr(Warehouse, "area_" + key)
>
> works only at the class level and translates someting like
> Warehouse.area.office into Warehouse.area_office. It's merely a
> Python trick to change how you access a particular class-level
> attribute.
>
> SQLA 0.4 and above prefer class-level attributes to create expression
> predicates. The ORM tutorials for 0.4 and 0.5 cover this in depth.
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