can load immediately via second select or via deferred columns.
needs work to reduce complexity and possibly to improve upon unnecessary work
performed by ColumnLoader objects hitting lots of non-existent columns
- would like to add post_exec() step to MapperProperty...but need to devise some way
such that MapperProperty instances can register themselves in the SelectContext as
requiring post_exec....otherwise we add huge method call overhead (and there is too
much already)
- fix to deferred loading so that the attributes loaded by "group" deferred loading
get proper CommittedState
- some refactoring to attributes to support setting attributes as committed
that the class of object attached to a parent object is appropriate
(i.e. if A.items stores B objects, raise an error if a C is appended to A.items)
- new extension sqlalchemy.ext.associationproxy, provides transparent "association object"
mappings. new example examples/association/proxied_association.py illustrates.
- some example cleanup
inheritance. relations now create priamry/secondary joins against that lead table. if you want to create it against
an inherited table, use explicit join conditions.
added 'correlate' argument to CompoundSelect to get polymorph example working again.
fixes to relation to enable it to locate "direction" more consistently with inheritance relationships
more tweaks to parenthesizing subqueries, unions, etc.
Mike Bayer