currently there is no "wrapping of properties" going on, SA sets its
own property-like object which replaces one that was already there.
so you just need to operate upon a different property name, usually
"_attr", and tell your mapper about the alternate column mapping like
this:
m = Mapper(Entity, entities, properties = {
'_attr': entities.c.attr
})
I have just added a similar example to the "basic datamapping"
synopsis in the docs since this question is the most common.
On Feb 20, 2006, at 11:08 AM, dmiller wrote:
When I first read the SA documentation I got the impression I could
do this:
class Entity(object):
def _get_attr(self):
# get logic
def _set_attr(self):
# set logic
attr = property(_get_attr, _set_attr)
entities = Table("entities",
Column("id", ...),
Column("attr", ...)
)
m = Mapper(Entity, entities)
I got the impression that SQLAlchemy would transparently wrap
access to Entity.attr to track history, etc. However, I was rudely
awakened when I realized that such code was not working...my
"Entity.attr" property is simply overwritten by
AttributeManager.register_attribute(...), which puts a
SmartProperty there instead.
Am I overlooking something? Is there a way to do this? Could
AttributManager and/or SmartProperty be improved to support
properties as well as normal attributes?
~ Daniel
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