Django 1.4 first session save lost data

fixes #477

docs/changelog.rst

@@ -4,6 +4,7 @@ Changelog
 
 Changes in 0.6.X
 ================
+- Fixed Django 1.4 sessions first save data loss
 - FileField now automatically delete files on .delete()
 - Fix for GenericReference to_mongo method
 - Fixed connection regression

mongoengine/django/sessions.py

@@ -55,7 +55,7 @@ class SessionStore(SessionBase):
 
     def save(self, must_create=False):
         if self.session_key is None:
-            self.create()
+            self._session_key = self._get_new_session_key()
         s = MongoSession(session_key=self.session_key)
         s.session_data = self.encode(self._get_session(no_load=must_create))
         s.expire_date = self.get_expiry_date()

tests/django_tests.py

@@ -103,3 +103,8 @@ class MongoDBSessionTest(SessionTestsMixin, unittest.TestCase):
         MongoSession.drop_collection()
         super(MongoDBSessionTest, self).setUp()
 
+    def test_first_save(self):
+        session = SessionStore()
+        session['test'] = True
+        session.save()
+        self.assertTrue('test' in session)