The skill-map response gave units -> nodes with id/title/status but no way
to map a node to its lessons, and no other endpoint fills that gap
(/api/progress/nodes doesn't either). Any client rendering the map needs
this to know which lesson to open when a node is tapped.
The ids are already computed in the cached _grade_tree; this just surfaces
them. Additive and backward-compatible; content tests pass.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
GET /api/home is the most-hit authenticated endpoint (every app open) and
was running one COUNT per node. Now it is a flat number of queries
regardless of grade size, and the shared curriculum skeleton is served
from cache; per-user progress/stats stay live.
content/views.py
- _node_status(): takes a precomputed set of completed lesson_ids and a
node's lesson_ids instead of firing its own COUNT query.
- HomeView.get(): one query for all completed lesson_ids of the user in
the grade, status computed in Python; grade tree (units -> nodes ->
lesson_ids, no per-user data) read from cache
(content:tree:grade:{id}:v{N}); missing grade -> 404 (was an
unhandled 500); grade with no units -> empty units, not 404.
- GradesListView: served from cache (content:grades:v{N}).
- curriculum_version() / bump_curriculum_version(): one shared version
key; bumping it invalidates every content cache key at once.
- both GET views get throttle_scope='read' + GuestAwareContentThrottle.
content/receivers.py
- post_save/post_delete on Grade/Unit/Node/Lesson -> bump_curriculum_version().
content/tests.py
- HomeViewScalabilityTests: query count flat for 2 vs 20 nodes; 2nd call
hits cache (no content_unit/node SQL); a new Node invalidates the tree;
missing grade 404; empty grade 200.
- GradesListCacheTests: list cached, invalidated on new Grade.
- ReadThrottleTests: /api/home returns 429 past the limit.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The math-app frontend prototype drives a RobotMascot with a fixed set of
moods; this gives that animation an explicit backend signal. Complements
the existing Lesson.mascot_animation / LessonIntro.mascotAnimation, which
are unchanged.
serializers.py
- AnswerResponseSerializer: new mascotMood field.
views.py
- QuestionAnswerView: mascotMood = 'happy' for a correct answer else
'encourage', on both the fresh response and the idempotent-replay
response.
tests.py
- QuestionAnswerMascotMoodTests: correct -> happy, wrong -> encourage,
and the mood is preserved across an idempotent replay.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
