orm.ext.declared_attr.cascading have incorrect example in docstringpr/306

There is an error in code example in docstring for
declared_attr.cascading.

1 files changed, 7 insertions, 9 deletions

diff --git a/lib/sqlalchemy/ext/declarative/api.py b/lib/sqlalchemy/ext/declarative/api.py
index 1abd0467e..8a69bde46 100644
--- a/lib/sqlalchemy/ext/declarative/api.py
+++ b/lib/sqlalchemy/ext/declarative/api.py
@@ -196,19 +196,17 @@ class declared_attr(interfaces._MappedAttribute, property):
         Below, both MyClass as well as MySubClass will have a distinct
         ``id`` Column object established::
 
-            class HasSomeAttribute(object):
+            class HasIdMixin(object):
                 @declared_attr.cascading
-                def some_id(cls):
+                def id(cls):
                     if has_inherited_table(cls):
-                        return Column(
-                            ForeignKey('myclass.id'), primary_key=True)
+                        return Column('id', Integer, primary_key=True)
                     else:
-                        return Column(Integer, primary_key=True)
+                        return Column('id', Integer, ForeignKey('myclass.id'),
+                                      primary_key=True)
 
-                    return Column('id', Integer, primary_key=True)
-
-            class MyClass(HasSomeAttribute, Base):
-                ""
+            class MyClass(HasIdMixin, Base):
+                __tablename__ = 'myclass'
                 # ...
 
             class MySubClass(MyClass):