need delete-orphan

diff --git a/doc/build/content/session.txt b/doc/build/content/session.txt
index f9d8f4ed99ccad453fe9fbfd618fb31c0e9ff4ea..e8ec743c313d3a8465b317fc9e68790b7517c1b6 100644 (file)
--- a/doc/build/content/session.txt
+++ b/doc/build/content/session.txt
@@ -229,7 +229,7 @@ The solution is to use proper cascading:
 
     {python}
     mapper(User, users_table, properties={
-        'addresses':relation(Address, cascade="all, delete")
+        'addresses':relation(Address, cascade="all, delete, delete-orphan")
     })
     del user.addresses[1]
     session.flush()