ac39692a8a
I needed this change because I found a bug: 1. Create a block with children in a content library 2. Delete that content library 3. Create a new identical block with children in a new content library. 4. If the OLX is identical to the original block, this new block will not load in the LMS. The reason for the bug is that the .children field contains usage keys (which encode the library, for example), but the values were being stored in BlockstoreFieldData which caches really aggressively and caches based on the hash of the OLX. Since the OLX is identical, it assumes the .children values should be identical as well. The fix was to move children to a children-specific field data store, and only store the part of the child data that is encoded by the OLX (the <xblock-include> data) in BlockstoreFieldData. This is a better match for the way the caching works and cleaned up a hacky part of the runtime (at least it's slightly less hacky now).
Open edX -------- This is the root package for Open edX. The intent is that all importable code from Open edX will eventually live here, including the code in the lms, cms, and common directories. If you're adding a new Django app, place it in core/djangoapps. If you're adding utilities that require Django, place them in core/djangolib. If you're adding code that defines no Django models or views of its own but is widely useful, put it in core/lib. Note: All new code should be created in this package, and the legacy code will be moved here gradually. For now the code is not structured like this, and hence legacy code will continue to live in a number of different packages.