mercadodevida/work/artifacts/F-007/implementer.md

Implementer — F-007 Categories module

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Summary

Implemented the categories module as a hexagonal backend slice with PostgreSQL persistence, Fastify routes, validation, tree handling, slug public URLs, and tests.

Changed files

• project/src/modules/categories/domain/category.ts
• project/src/modules/categories/domain/errors.ts
• project/src/modules/categories/domain/ports.ts
• project/src/modules/categories/application/category-use-cases.ts
• project/src/modules/categories/infrastructure/pg-category-repository.ts
• project/src/modules/categories/api/categories.routes.ts
• project/src/modules/categories/index.ts
• project/migrations/005_categories.js
• project/src/app/build-app.ts
• project/src/modules/categories/tests/category-use-cases.test.ts
• project/src/app/tests/categories.itest.ts
• backlog/features.json
• work/current.md
• work/artifacts/F-007/architect.md

Acceptance traceability

1. Duplicate slug returns HTTP 409
   • Implemented through categories_categories.slug UNIQUE and CATEGORY_SLUG_EXISTS mapping.
   • Covered by project/src/app/tests/categories.itest.ts (returns HTTP 409 for duplicate slug).
2. Category tree supports parent/child and blocks cycles
   • Implemented with adjacency list parent_id, tree builder, self-parent guard, recursive descendant check.
   • Covered by unit and integration tests.
3. Public URL is /categoria/<slug>, never internal id
   • Implemented GET /categoria/:slug and serialized url: /categoria/<slug>.
   • Covered by integration test.
4. verify.sh green
   • Verified after implementation.

Commands run

• cd project && npm run typecheck — PASS
• cd project && npm test — PASS: 55 passed, 25 skipped (DB integration skipped without TEST_DATABASE_URL)
• cd project && npm run lint — PASS after Prettier normalization
• cd project && npm run build — PASS
• cd project && npm run lint:boundaries — PASS: 61 files checked
• ./scripts/verify.sh — PASS

Notes

• No new npm dependencies.
• Category mutation routes are admin-only using the existing shared auth contract injected from the composition root.
• Public reads (GET /categories/tree, GET /categoria/:slug) are unauthenticated.
• Corrected delete behavior during review preparation: missing category now maps to 404 NOT_FOUND; category with children maps to 409 CATEGORY_HAS_CHILDREN.
• Documentation stage should update README/API notes because new user-facing endpoints were added.