Added version history to api keys. This needed a bit of change

to create history to handle foreign keys better. There may yet
be a better way of doing this that I have not found yet in sqlalchemy
docs.

app/dao/dao_utils.py

@@ -1,22 +1,6 @@
-import datetime
-
+import itertools
 from functools import wraps
-
-
-def create_history(obj):
-    history_mapper = obj.__history_mapper__
-    history_model = history_mapper.class_
-    history = history_model()
-    if obj.version:
-        obj.version += 1
-    else:
-        obj.version = 1
-        obj.created_at = datetime.datetime.now()
-    for prop in history_mapper.iterate_properties:
-        if obj.__mapper__.get_property(prop.key):
-            setattr(history, prop.key, getattr(obj, prop.key))
-    history.created_by_id = obj.created_by.id
-    return history
+from app.history_meta import versioned_objects, create_history
 
 
 def transactional(func):
@@ -37,12 +21,10 @@ def transactional(func):
 def versioned(func):
     @wraps(func)
     def record_version(*args, **kwargs):
-        import itertools
         from app import db
-        from app.history_meta import versioned_objects
-        from app.dao.dao_utils import create_history
         func(*args, **kwargs)
-        for obj in versioned_objects(itertools.chain(db.session.new, db.session.dirty)):
-            history = create_history(obj)
-            db.session.add(history)
+        history_objects = [create_history(obj) for obj in
+                           versioned_objects(itertools.chain(db.session.new, db.session.dirty))]
+        for h_obj in history_objects:
+            db.session.add(h_obj)
     return record_version