I've got the expression part of the hybrid properties working now, using an
alias:
@friend_code_usage_count.expression
def friend_code_usage_count(cls):
alias = aliased(AffinionCode)
return select([func.count(alias.Rtid)]). \
where(alias.PromoCode ==
I do have a follow up, actually.
If I wanted to make friend_code_usage_count a column property so that it
was always loaded with the object, how would I do that?
It doesn't look like I can add
alias = aliased(AffinionCode)
within the class definition. Where/how would I define the alias?
For a fancy column_property like that you likely need to define it after
the fact and attach it to the class. There's some new features I have
in the works for 1.0 to make that easier.
The general idea is:
class MyClass(Base):
# ...
alias = aliased(MyClass)
stmt =
cool, thanks again.
On Monday, August 11, 2014 1:19:30 PM UTC-5, Michael Bayer wrote:
For a fancy column_property like that you likely need to define it after
the fact and attach it to the class. There's some new features I have in
the works for 1.0 to make that easier.
The general
I'm having trouble getting a self-referential table to alias correctly.
In the example below, Jack was given a family code of 'FOO.' He shares
this with his family member Jill, who enters it as her PromoCode.
RtidPromoCodeFamilyCode JackBARFOO JillFOO
This is my sqlalchemy class for the
it seems like you might want to make use of aliased() in those
@hybrid_properties you have; if you do an equijoin from AffinionCode.something
== cls.somethingelse, “cls” here is AffinionCode again. One side should be an
aliased() object.
On Aug 10, 2014, at 8:01 PM, dweitzenfeld
