DDD tactical patterns for complex business modeling including entities, value objects, aggregates, domain services, repositories, specifications, and bounded contexts. Python dataclass implementations with TypeScript alternatives. Use when building rich domain models, enforcing invariants, or separating domain logic from infrastructure.
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What the file says
# Domain-Driven Design Tactical Patterns
Model complex business domains with entities, value objects, and bounded contexts.
## Overview
- Modeling complex business logic
- Separating domain from infrastructure
- Establishing clear boundaries between subdomains
- Building rich domain models with behavior
- Implementing ubiquitous language in code
## Building Blocks Overview
```
┌─────────────────────────────────────────────────────────────┐
│ DDD Building Blocks │
├─────────────────────────────────────────────────────────────┤
│ ENTITIES VALUE OBJECTS AGGREGATES │
│ Order (has ID) Money (no ID) [Order]→Items │
│ │
│ DOMAIN SERVICES REPOSITORIES DOMAIN EVENTS │
│ PricingService IOrderRepository OrderSubmitted │
│ │
│ FACTORIES SPECIFICATIONS MODULES │
│ OrderFactory OverdueOrderSpec orders/, payments/ │
└─────────────────────────────────────────────────────────────┘
```
## Quick Reference
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