Adds the concept of "downstream-only" fields to the XBlock upstream sync logic.
Downstream-only fields are customizable fields set only on the downstream XBlock -- we don't keep track of the upstream field value anywhere on the downstream XBlock. Changes made to these fields in the upstream block are ignored, and if the link to the upstream block is severed, the downstream changes are preserved (not reset back to defaults, like the upstream-tracked customizable fields are).
The fields chosen as "downstream-only" are those related to scoring and grading.
The `max_attempts` field was previously a customizable field that tracked the upstream value. However, because it is scoring-related, it has been converted to a "downstream-only" field.
This change impacts course authors' use of library content in their courses.
* feat: Copy tags when sync library
* feat: Avoid delete object tag if is copied
* chore: Bump version of openedx-learning to 0.16.0
* test: Tests for copy paste library blocks
* feat: Sync tags when sync upstream
This introdues the idea of "upstream" and "downstream" content,
where downstreams (like course components) can pull content updates from
upstreams (like learning core-backed content library blocks). This
supports the upcoming Content Libraries Relaunch Beta for Sumac.
New features include:
* A new XBlockMixin: UpstreamSyncMixin.
* A new CMS Python API: cms.lib.xblock.upstream_sync
* A new CMS JSON API: /api/contentstore/v2/downstreams
* A temporary, very basic UI for syncing from Content Library blocks
Implements:
https://github.com/kdmccormick/edx-platform/blob/kdmccormick/upstream-proto/docs/decisions/0020-upstream-block.rst
Co-authored-by: Braden MacDonald <braden@opencraft.com>
