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>
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>
