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…shing + Error Logging fix
Features implemented: - Category entity with self-referential relationships - Hierarchical categories (2-level depth maximum) - Auto-generated slugs for SEO-friendly URLs (fast-food, burgers, etc.) - Full CRUD operations with proper authorization - Soft delete functionality (preserves data, sets isActive=false) - Data validation with class-validator DTOs - Business rules enforcement: * Maximum 2-level nesting (root > parent > child) * Duplicate name prevention (409 Conflict) * Circular reference prevention * Parent existence validation * Slug uniqueness with automatic numbering Endpoints implemented: - POST /api/v1/categories (admin only) - GET /api/v1/categories (public) - GET /api/v1/categories/root (public) - GET /api/v1/categories/slug/:slug (public) - GET /api/v1/categories/:id (public) - PATCH /api/v1/categories/:id (admin only) - DELETE /api/v1/categories/:id (admin only - soft delete) - DELETE /api/v1/categories/:id/hard (admin only - permanent) Technical implementation: - Self-referential TypeORM relationships (@manytoone, @onetomany) - Slug generation with slugify library and uniqueness checking - TypeORM IsNull() operator for NULL value queries - Constructor-based dependency injection - Guard chain (JwtAuthGuard + RolesGuard) for RBAC - Proper HTTP status codes (201, 204, 400, 401, 403, 404, 409) - Query parameter support for admin views (includeInactive) Testing completed: ✅ CRUD operations verified ✅ Hierarchical data structure tested ✅ Validation error handling confirmed (duplicate, invalid UUID) ✅ Authorization (RBAC) working correctly ✅ Soft delete functionality verified (204 response, isActive=false) ✅ Slug auto-generation tested (fast-food, burgers, pizza) ✅ Parent-child relationships loading correctly Database structure: - 6 categories created (3 root, 3 children) - Fast Food > Burgers, Pizza, Fried Chicken - Beverages (root) - Desserts (root, soft deleted)
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