late compilation of mappers. now you can create mappers in any order, and they will compile their internal state when first used in a query or flush operation (or their props or 'c'/'columns' attributes are used). includes various cleanups and fixes in support of the change, including some unit test changes, additional unit tests.

1 files changed, 4 insertions, 1 deletions

diff --git a/examples/backref/backref_tree.py b/examples/backref/backref_tree.py
index 3f81b1145..d217b22f1 100644
--- a/examples/backref/backref_tree.py
+++ b/examples/backref/backref_tree.py
@@ -19,7 +19,7 @@ table.create()
 
 mapper(Tree, table,
               properties={
-                'childs':relation(Tree, foreignkey=table.c.father_id, primaryjoin=table.c.father_id==table.c.id,  backref=backref('father', uselist=False, foreignkey=table.c.id))},
+                'childs':relation(Tree, foreignkey=table.c.father_id, primaryjoin=table.c.father_id==table.c.id,  backref=backref('father', foreignkey=table.c.id))},
             )
 
 root = Tree('root')
@@ -27,6 +27,9 @@ child1 = Tree('child1', root)
 child2 = Tree('child2', root)
 child3 = Tree('child3', child1)
 
+child4 = Tree('child4')
+child1.childs.append(child4)
+
 session = create_session()
 session.save(root)
 session.flush()