On Tuesday 05 December 2006 18:17, Diez B. Roggisch wrote:
> Hi,
>
> I just found out that multiple inheritance doesn't work over more than one
> level. Is this an oversight, and people are interested in having a solution
> for this, or is it by design?
I have to paraphrase that: the real problem seems not to be that the support
isn't there - it it that the childName columns value isn't distinguishing
_all_ subclasses on the topmost class, as I was expecting. Consider this
example:
class A(InhSQLO):
pass
class B(A):
pass
class C(B):
pass
This will result in a table "a" with a childName column. But additionally,
table "b" will have a childName column.
If creating an instance of C, you'd end up with a row in 'a' that has
childName set to 'B', and then a row in 'b' that has also a childName, which
then is set to 'C'.
The problem here for me is: how do I create a sql query that filters over the
different types?
Using
A.select(B.q.childName == 'C')
to get all Cs translates to
SELECT a.id, a.child_name, a.a FROM a WHERE ((a.child_name) = ('C'))
So - any idea how to accomplish that?
Regards,
--
>> Diez B. Roggisch
>> Developer
T +49 (30) 443 50 99 - 27
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>> artnology GmbH
A Milastraße 4 / D-10437 Berlin
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