- Fixed two issues in the "history_meta" example where history tracking

could encounter empty history, and where a column keyed to an alternate
attribute name would fail to track properly.  Fixes courtesy
Alex Fraser.

(cherry picked from commit d57e5edbcd)

doc/build/changelog/changelog_10.rst

@@ -18,6 +18,15 @@
 .. changelog::
     :version: 1.0.9
 
+    .. change::
+        :tags: bug, examples
+        :versions: 1.1.0b1
+
+        Fixed two issues in the "history_meta" example where history tracking
+        could encounter empty history, and where a column keyed to an alternate
+        attribute name would fail to track properly.  Fixes courtesy
+        Alex Fraser.
+
     .. change::
         :tags: bug, orm
         :tickets: 3510

examples/versioned_history/history_meta.py

@@ -210,13 +210,13 @@ def create_version(obj, session, deleted=False):
             a, u, d = attributes.get_history(obj, prop.key)
 
             if d:
-                attr[hist_col.key] = d[0]
+                attr[prop.key] = d[0]
                 obj_changed = True
             elif u:
-                attr[hist_col.key] = u[0]
-            else:
+                attr[prop.key] = u[0]
+            elif a:
                 # if the attribute had no value.
-                attr[hist_col.key] = a[0]
+                attr[prop.key] = a[0]
                 obj_changed = True
 
     if not obj_changed:

examples/versioned_history/test_versioning.py

@@ -614,3 +614,68 @@ class TestVersioning(TestCase, AssertsCompiledSQL):
         sess.commit()
 
         assert sc.version == 1
+
+    def test_create_double_flush(self):
+
+        class SomeClass(Versioned, self.Base, ComparableEntity):
+            __tablename__ = 'sometable'
+
+            id = Column(Integer, primary_key=True)
+            name = Column(String(30))
+            other = Column(String(30))
+
+        self.create_tables()
+
+        sc = SomeClass()
+        self.session.add(sc)
+        self.session.flush()
+        sc.name = 'Foo'
+        self.session.flush()
+
+        assert sc.version == 2
+
+    def test_mutate_plain_column(self):
+        class Document(self.Base, Versioned):
+            __tablename__ = 'document'
+            id = Column(Integer, primary_key=True, autoincrement=True)
+            name = Column(String, nullable=True)
+            description_ = Column('description', String, nullable=True)
+
+        self.create_tables()
+
+        document = Document()
+        self.session.add(document)
+        document.name = 'Foo'
+        self.session.commit()
+        document.name = 'Bar'
+        self.session.commit()
+
+        DocumentHistory = Document.__history_mapper__.class_
+        v2 = self.session.query(Document).one()
+        v1 = self.session.query(DocumentHistory).one()
+        self.assertEqual(v1.id, v2.id)
+        self.assertEqual(v2.name, 'Bar')
+        self.assertEqual(v1.name, 'Foo')
+
+    def test_mutate_named_column(self):
+        class Document(self.Base, Versioned):
+            __tablename__ = 'document'
+            id = Column(Integer, primary_key=True, autoincrement=True)
+            name = Column(String, nullable=True)
+            description_ = Column('description', String, nullable=True)
+
+        self.create_tables()
+
+        document = Document()
+        self.session.add(document)
+        document.description_ = 'Foo'
+        self.session.commit()
+        document.description_ = 'Bar'
+        self.session.commit()
+
+        DocumentHistory = Document.__history_mapper__.class_
+        v2 = self.session.query(Document).one()
+        v1 = self.session.query(DocumentHistory).one()
+        self.assertEqual(v1.id, v2.id)
+        self.assertEqual(v2.description_, 'Bar')
+        self.assertEqual(v1.description_, 'Foo')