domain-driven

Domain-Driven Design Skill — Complete Business Module Builder

This skill ensures every business module is built completely with all sub-modules, CRUD operations, relationships, and business rules — NO mockups, NO placeholders.

Module Discovery Protocol

When asked to build an business module:

Step 1: Enumerate Sub-Modules

For module "Inventory", identify:
├── Products (CRUD + categories, variants, pricing)
├── Warehouses (CRUD + locations, capacity)
├── Stock Movements (CRUD + types: in, out, transfer)
├── Suppliers (CRUD + contacts, contracts)
├── Purchase Orders (CRUD + lines, receiving)
├── Stock Counts (CRUD + adjustments)
└── Reports (Read-only analytics)

Step 2: Entity Relationship Map

Product ──< ProductVariant >── Attribute
  │
  ├──< StockItem >── Warehouse
  │
  └──< PurchaseOrderLine >── PurchaseOrder >── Supplier

Step 3: CRUD Completeness Matrix

For EVERY entity, verify ALL operations:

Entity	Create	Read List	Read Detail	Update	Delete	Restore
Product	✅	✅ + filters	✅ + variants	✅ partial	✅ soft	✅
...	...	...	...	...	...	...

Implementation Rules

NO Mock Implementations

Every function must contain REAL implementation logic:

// ❌ FORBIDDEN - Mock/Placeholder
async getProducts() {
  return []; // TODO: implement
}

// ✅ REQUIRED - Real Implementation
async getProducts(filters: ProductFilters, pagination: Pagination): Promise<PaginatedResult<Product>> {
  const query = this.repository.createQueryBuilder('p')
    .leftJoinAndSelect('p.category', 'category')
    .leftJoinAndSelect('p.variants', 'variant');

  if (filters.categoryId) {
    query.andWhere('p.categoryId = :categoryId', { categoryId: filters.categoryId });
  }
  if (filters.search) {
    query.andWhere('(p.name ILIKE :search OR p.sku ILIKE :search)', { search: `%${filters.search}%` });
  }

  query.orderBy('p.createdAt', 'DESC');
  return query.paginate(pagination);
}