- Fixed bug where a column with a SQL or server side default

that was excluded from a mapping with include_properties
or exclude_properties would result in UnmappedColumnError.
[ticket:1995]

CHANGES

@@ -218,6 +218,11 @@ CHANGES
     from that target. Also emits the correct WHERE criterion
     when using single table inheritance. [ticket:2038]
 
+ - Fixed bug where a column with a SQL or server side default
+   that was excluded from a mapping with include_properties
+   or exclude_properties would result in UnmappedColumnError.
+   [ticket:1995]
+
 - sql
   - Column.copy(), as used in table.tometadata(), copies the 
     'doc' attribute.  [ticket:2028]

lib/sqlalchemy/orm/mapper.py

@@ -1937,7 +1937,8 @@ class Mapper(object):
         if postfetch_cols:
             state.expire_attributes(state.dict, 
                                 [self._columntoproperty[c].key 
-                                for c in postfetch_cols]
+                                for c in postfetch_cols if c in 
+                                self._columntoproperty]
                             )
 
         # synchronize newly inserted ids from one table to the next

test/orm/test_mapper.py

@@ -533,6 +533,21 @@ class MapperTest(_fixtures.FixtureTest):
             Foo, inherits=Person, polymorphic_identity='foo',
             exclude_properties=('type', ),
             )
+    @testing.resolve_artifact_names
+    @testing.provide_metadata
+    def test_prop_filters_defaults(self):
+        t = Table('t', metadata,
+               Column('id', Integer(), primary_key=True, test_needs_autoincrement=True),
+               Column('x', Integer(), nullable=False, server_default='0')
+              )
+        t.create()
+        class A(object):
+            pass
+        mapper(A, t, include_properties=['id'])
+        s = Session()
+        s.add(A())
+        s.commit()
+
 
     @testing.resolve_artifact_names
     def test_mapping_to_join_raises(self):