Since django CMS 2.0 we relied on MPTT (Modified Preorder Tree Traversal) for efficiently handling tree structures in the DB. Over the years it proved that MPTT was not fast enough for big tree operations (>1000 pages) and regularly the tree got corrupted because of transactional errors.
In 3.1 we replaced MPTT for MP (Materialized Path). MP is more efficient and has more error resistance then MPTT. It should make the whole django CMS experience way better, faster and reliable.
Be sure to run manage.py cms fix-mptt before you upgrade.
Starting from version 3.1 the supported Django versions are 1.6 and 1.7
Migrations packages has been renamed to the standard layout:
- Django 1.7 migrations are now into standard cms.migrations and menus.migrations packages
- South migrations are now in cms.south_migrations and menus.south_migrations packages
South 1.0.1 is now required to correctly handle the above layout; if you are upgrading from Django 1.7 / django CMS 3.0.6, please remove the old migration path from MIGRATION_MODULES settings.