stapel-categories 0.4.0

Category tree for the Stapel framework

stapel-categories

Category tree with typed features for the Stapel framework — composable Django apps that deploy as a monolith or as microservices without changing module code.

A hierarchical category tree (django-treenode) and a parallel feature tree whose typed config is validated by stapel-attributes. Categories own the tree structure, feature inheritance, the ordered category↔feature M2M, and the feature-editor lifecycle; the attribute engine (types, config/DTO/DAO validation, polymorphic serializers, admin widgets) lives in stapel-attributes and is imported, never re-implemented.

Install

pip install stapel-categories

INSTALLED_APPS = [
    # ...
    "treenode",            # django-treenode (tree-cache signals)
    "stapel_categories",
]

# urls.py — the host chooses the prefix
path("categories/", include("stapel_categories.urls"))

stapel-attributes is an imported library (no app to install); its config editor ships static assets, so run collectstatic if you use the admin.

Settings

All configuration lives in the STAPEL_CATEGORIES namespace (dict setting, flat setting, or env var — resolved lazily):

Key	Default	Meaning
CAROUSEL_CACHE_TIMEOUT	300	Seconds the carousel response is cached.
FEATURE_DISPLAY_CACHE_TIMEOUT	60	Seconds an admin feature display label is memoized.
DISPLAY_TRANSLATOR	stapel_categories.translation.identity_translator	Dotted path (key)->str for rendering translation keys (default: identity).

comm surface

Kind	Name	Contract
Function	categories.features	{"category_id": int} -> {"category_id", "revision", "features":[{id,slug,name,mandatory,config}]} — resolved schema (own + inherited), cacheable by revision
Action (emit)	category.changed	{"category_id": int, "revision": int} on any category/feature mutation — for downstream cache invalidation

categories.features lets stapel-listings validate attribute values against a category's schema without importing this module.

Extension points

See MODULE.md — the agent-facing map of every fork-free seam (settings, serializer seams, comm surface, feature-editor actions, admin-UI pointer to stapel-attributes).

Development

pip install -e . && pip install pytest pytest-django ruff
./setup-hooks.sh
pytest tests/

License

MIT