On 6 Feb 2006, at 20:10, Michael Bayer wrote:
I would rather the ability to place a different mapper on a subclass
without it inheriting the base class' table, if an inherit
relationship is
not defined. That way you can make subclasses that just get stored
in a
different table, or subclasses that get stored exactly the same way
except
you're getting them from a different mapper that knows how to
create those
subclasses. There also might be interesting dependency
relationships that
can be set up when playing around with this kind of thing.
I doubt the above patterns work right now though, sounds like a good
ticket to add to trac.
Interestingly it turns out that I actually need to use one of those
patterns
(I have an object that inherits from another one that has a mapper,
but I
don't want to use the mapper from the original one because it does
something
special.) It does seem to work, provided the other part of that
patch (the
bit that doesn't check for inherits) has been applied; I've separated
it out
below.
Kind regards,
Alastair.
Index: lib/sqlalchemy/mapping/mapper.py
===================================================================
--- lib/sqlalchemy/mapping/mapper.py (revision 926)
+++ lib/sqlalchemy/mapping/mapper.py (working copy)
@@ -168,7 +168,8 @@
self._get_clause.clauses.append(primary_key ==
sql.bindparam("pk_"+primary_key.key))
if (
- (not hasattr(self.class_, '_mapper') or not
mapper_registry.has_key(self.class_._mapper))
+ (not self.class_.__dict__.has_key('_mapper')
+ or not mapper_registry.has_key(self.class_._mapper))
or self.is_primary
or (inherits is not None and
inherits._is_primary_mapper())
):
--
http://www.alastairs-place.net
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