docs
This commit is contained in:
@@ -1,207 +1,442 @@
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Frontend & Backend Output Shapes – Clean Architecture (Strict, Final)
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Clean Architecture – Application Services, Use Cases, Ports, and Data Flow (Strict, Final)
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This document defines the exact responsibilities, naming, and placement of all data shapes involved in delivering data from Core → API → Frontend UI.
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This document defines the final, non-ambiguous Clean Architecture setup for the project.
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It resolves all ambiguity around Presenters, View Models, DTOs, and Output Ports.
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There is no overlap of terminology across layers.
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It explicitly covers:
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• Use Cases vs Application Services
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• Input & Output Ports (and what does not exist)
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• API responsibilities
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• Frontend responsibilities
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• Naming, placement, and dependency rules
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• End-to-end flow with concrete paths and code examples
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There are no hybrid concepts, no overloaded terms, and no optional interpretations.
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⸻
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1. Core Layer (Application / Use Cases)
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1. Architectural Layers (Final)
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Core Output Ports (formerly “Presenters”)
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Domain → Business truth
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Application → Use Cases + Application Services
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Adapters → API, Persistence, External Systems
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Frontend → UI, View Models, UX logic
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In the Core, a Presenter is not a UI concept.
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Only dependency-inward is allowed.
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It is an Output Port that defines how a Use Case emits its result.
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⸻
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2. Domain Layer (Core / Domain)
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What lives here
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• Entities (classes)
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• Value Objects (classes)
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• Domain Services (stateless business logic)
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• Domain Events
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• Domain Errors / Invariants
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What NEVER lives here
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• DTOs
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• Models
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• Ports
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• Use Cases
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• Application Services
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• Framework code
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⸻
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3. Application Layer (Core / Application)
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The Application Layer has two distinct responsibilities:
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1. Use Cases – business decisions
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2. Application Services – orchestration of multiple use cases
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⸻
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4. Use Cases (Application / Use Cases)
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Definition
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A Use Case represents one business intent.
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Examples:
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• CreateLeague
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• ApproveSponsorship
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• CompleteDriverOnboarding
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Rules
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• Core Output Ports:
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• define what data is emitted
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• do not store state
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• do not expose getters
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• do not reference DTOs or View Models
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• Core never pulls data back from an output port
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• Core calls present() and stops
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• A Use Case:
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• contains business logic
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• enforces invariants
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• operates on domain entities
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• communicates ONLY via ports
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• A Use Case:
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• does NOT orchestrate multiple workflows
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• does NOT know HTTP, UI, DB, queues
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Naming
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• *OutputPort
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• *Result (pure application result)
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Structure
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core/racing/application/use-cases/
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└─ CreateLeagueUseCase.ts
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Example
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export interface CompleteDriverOnboardingResult {
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readonly success: boolean;
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readonly driverId?: string;
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readonly error?: string;
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export class CreateLeagueUseCase {
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constructor(
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private readonly leagueRepository: LeagueRepositoryPort,
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private readonly output: CreateLeagueOutputPort
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) {}
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execute(input: CreateLeagueInputPort): void {
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// business rules & invariants
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const league = League.create(input.name, input.maxMembers);
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this.leagueRepository.save(league);
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this.output.presentSuccess(league.id);
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}
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}
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export interface CompleteDriverOnboardingOutputPort {
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present(result: CompleteDriverOnboardingResult): void;
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⸻
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5. Ports (Application / Ports)
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The Only Two Kinds of Ports
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Everything crossing the Application boundary is a Port.
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Input Ports
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Input Ports describe what a use case needs.
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export interface CreateLeagueInputPort {
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readonly name: string;
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readonly maxMembers: number;
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}
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The Core does not know or care what happens after present() is called.
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Rules:
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• Interfaces only
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• No behavior
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• No validation logic
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⸻
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2. API Layer (Delivery / Adapter)
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Output Ports
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API Presenters (Response Mappers)
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Output Ports describe how a use case emits outcomes.
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API Presenters are Adapters.
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export interface CreateLeagueOutputPort {
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presentSuccess(leagueId: string): void;
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presentFailure(reason: string): void;
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}
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They:
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• implement Core Output Ports
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• translate Core Results into API Response DTOs
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• store response state temporarily for the controller
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Rules:
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• No return values
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• No getters
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• No state
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• Use methods, not result objects
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They are not View Models.
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⸻
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6. Application Services (Application / Services)
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Definition
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An Application Service orchestrates multiple Use Cases.
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It exists because:
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• No single Use Case should know the whole workflow
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• Orchestration is not business logic
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Rules
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• API Presenters:
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• implement a Core Output Port
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• map Core Results → API Responses
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• may store state internally
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• API Presenters must not:
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• contain business logic
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• reference frontend View Models
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• Application Services:
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• call multiple Use Cases
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• define execution order
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• handle partial failure & compensation
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• Application Services:
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• do NOT contain business rules
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• do NOT modify entities directly
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Naming
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• *Presenter or *ResponseMapper
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• Output types end with Response or ApiResponse
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Structure
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core/racing/application/services/
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└─ LeagueSetupService.ts
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Example (with Edge Cases)
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export class LeagueSetupService {
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constructor(
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private readonly createLeague: CreateLeagueUseCase,
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private readonly createSeason: CreateSeasonUseCase,
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private readonly assignOwner: AssignLeagueOwnerUseCase,
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private readonly notify: SendLeagueWelcomeNotificationUseCase
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) {}
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execute(input: LeagueSetupInputPort): void {
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const leagueId = this.createLeague.execute(input);
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try {
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this.createSeason.execute({ leagueId });
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this.assignOwner.execute({ leagueId, ownerId: input.ownerId });
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this.notify.execute({ leagueId, ownerId: input.ownerId });
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} catch (error) {
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// compensation / rollback logic
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throw error;
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}
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}
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}
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Edge cases that belong ONLY here:
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• Partial failure handling
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• Workflow order
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• Optional steps
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• Retry / idempotency logic
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⸻
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3. Frontend Layer (apps/website)
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7. API Layer (apps/api)
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View Models (UI-Owned, Final Form)
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Responsibilities
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• Transport (HTTP)
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• Validation (request shape)
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• Mapping to Input Ports
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• Calling Application Services
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• Adapting Output Ports
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A View Model represents fully prepared UI state.
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Structure
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Only the frontend has Views — therefore only the frontend has View Models.
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apps/api/leagues/
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├─ LeagueController.ts
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├─ presenters/
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│ └─ CreateLeaguePresenter.ts
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└─ dto/
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├─ CreateLeagueRequestDto.ts
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└─ CreateLeagueResponseDto.ts
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Rules
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• View Models:
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• live only in apps/website
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• accept API Response DTOs as input
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• expose UI-ready data and helpers
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• View Models must not:
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• contain domain logic
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• validate business rules
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• perform side effects
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• be sent back to the server
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Naming
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• *ViewModel
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⸻
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4. Website Presenters (DTO → ViewModel)
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API Presenter (Adapter)
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export class CreateLeaguePresenter implements CreateLeagueOutputPort {
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private response!: CreateLeagueResponseDto;
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presentSuccess(leagueId: string): void {
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this.response = { success: true, leagueId };
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}
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presentFailure(reason: string): void {
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this.response = { success: false, errorMessage: reason };
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}
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getResponse(): CreateLeagueResponseDto {
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return this.response;
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}
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}
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⸻
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8. Frontend Layer (apps/website)
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The frontend layer contains UI-specific data shapes. None of these cross into the Core.
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There are three distinct frontend data concepts:
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1. API DTOs (transport)
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2. Command Models (user input / form state)
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3. View Models (UI display state)
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⸻
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8.1 API DTOs (Transport Contracts)
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API DTOs represent exact HTTP contracts exposed by the backend.
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They are usually generated from OpenAPI or manually mirrored.
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apps/website/lib/dtos/
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└─ CreateLeagueResponseDto.ts
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Rules:
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• Exact mirror of backend response
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• No UI logic
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• No derived values
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• Never used directly by components
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⸻
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8.2 Command Models (User Input / Form State)
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Command Models represent user intent before submission.
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They are frontend-only and exist to manage:
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• form state
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• validation feedback
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• step-based wizards
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They are NOT:
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• domain objects
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• API DTOs
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• View Models
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apps/website/lib/commands/
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└─ CreateLeagueCommandModel.ts
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Rules:
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• Classes (stateful)
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• May contain client-side validation
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• May contain UX-specific helpers (step validation, dirty flags)
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• Must expose a method to convert to an API Request DTO
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Example responsibility:
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• hold incomplete or invalid user input
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• guide the user through multi-step flows
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• prepare data for submission
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Command Models:
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• are consumed by components
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• are passed into services
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• are never sent directly over HTTP
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⸻
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8.3 View Models (UI Display State)
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View Models represent fully prepared UI state after data is loaded.
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apps/website/lib/view-models/
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└─ CreateLeagueViewModel.ts
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Rules:
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• Classes only
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• UI logic allowed (formatting, labels, derived flags)
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• No domain logic
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• No mutation after construction
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⸻
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8.4 Website Presenters (DTO → ViewModel)
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Website Presenters are pure mappers.
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They:
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• convert API Response DTOs into View Models
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• perform formatting and reshaping
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• are deterministic and side-effect free
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export class CreateLeaguePresenter {
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present(dto: CreateLeagueResponseDto): CreateLeagueViewModel {
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return new CreateLeagueViewModel(dto);
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}
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}
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They are not Core Presenters.
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Rules
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Rules:
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• Input: API DTOs
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• Output: View Models
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• Must not:
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• call APIs
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• read storage
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• perform decisions
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• No side effects
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• No API calls
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⸻
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5. API Client (Frontend)
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The API Client is a thin HTTP layer.
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Rules
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• Sends HTTP requests
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• Returns API DTOs only
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• Must not:
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• return View Models
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• contain business logic
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• format data for UI
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⸻
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6. Website Services (Orchestration)
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8.5 Website Services (Orchestration)
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Website Services orchestrate:
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• Command Models
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• API Client calls
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• Website Presenter mappings
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• Presenter mappings
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They are the only layer allowed to touch both.
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export class LeagueService {
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async createLeague(command: CreateLeagueCommandModel): Promise<CreateLeagueViewModel> {
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const dto = await this.api.createLeague(command.toRequestDto());
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return this.presenter.present(dto);
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}
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}
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Rules
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• Services:
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• call API Client
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• call Website Presenters
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• return View Models only
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• Components never touch API Client or DTOs
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Rules:
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• Services accept Command Models
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• Services return View Models
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• Components never call API clients directly
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⸻
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7. Final Data Flow (Unambiguous)
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View Models (UI State)
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Core Use Case
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→ OutputPort.present(Result)
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apps/website/lib/view-models/
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└─ CreateLeagueViewModel.ts
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API Presenter (Adapter)
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→ maps Result → ApiResponse
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export class CreateLeagueViewModel {
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constructor(private readonly dto: CreateLeagueResponseDto) {}
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API Controller
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→ returns ApiResponse (JSON)
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get message(): string {
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return this.dto.success
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? 'League created successfully'
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: this.dto.errorMessage ?? 'Creation failed';
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}
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}
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Frontend API Client
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→ returns ApiResponse DTO
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||||
Rules:
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• Classes only
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• UI logic allowed
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||||
• No domain logic
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||||
|
||||
Website Presenter
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||||
→ maps DTO → ViewModel
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⸻
|
||||
|
||||
Website Presenter (DTO → ViewModel)
|
||||
|
||||
export class CreateLeaguePresenter {
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present(dto: CreateLeagueResponseDto): CreateLeagueViewModel {
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return new CreateLeagueViewModel(dto);
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}
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||||
}
|
||||
|
||||
|
||||
⸻
|
||||
|
||||
Website Service (Orchestration)
|
||||
|
||||
export class LeagueService {
|
||||
constructor(
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private readonly api: LeaguesApiClient,
|
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private readonly presenter: CreateLeaguePresenter
|
||||
) {}
|
||||
|
||||
async createLeague(input: unknown): Promise<CreateLeagueViewModel> {
|
||||
const dto = await this.api.createLeague(input);
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||||
return this.presenter.present(dto);
|
||||
}
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||||
}
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||||
|
||||
|
||||
⸻
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||||
|
||||
9. Full End-to-End Flow (Final)
|
||||
|
||||
UI Component
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||||
→ consumes ViewModel
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||||
→ Website Service
|
||||
→ API Client
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||||
→ HTTP Request DTO
|
||||
→ API Controller
|
||||
→ Application Service
|
||||
→ Use Case(s)
|
||||
→ Domain
|
||||
→ Output Port
|
||||
→ API Presenter
|
||||
→ HTTP Response DTO
|
||||
→ Website Presenter
|
||||
→ View Model
|
||||
→ UI
|
||||
|
||||
|
||||
⸻
|
||||
|
||||
8. Terminology Rules (Strict)
|
||||
|
||||
Term Layer Meaning
|
||||
OutputPort Core Use case output contract
|
||||
Result Core Pure application result
|
||||
Presenter (API) apps/api Maps Result → API Response
|
||||
Response / ApiResponse apps/api HTTP transport shape
|
||||
Presenter (Website) apps/website Maps DTO → ViewModel
|
||||
ViewModel apps/website UI-ready state
|
||||
|
||||
No term is reused with a different meaning.
|
||||
10. Final Non-Negotiable Rules
|
||||
• Core knows ONLY Ports + Domain
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||||
• Core has NO Models, DTOs, or ViewModels
|
||||
• API talks ONLY to Application Services
|
||||
• Controllers NEVER call Use Cases directly
|
||||
• Frontend Components see ONLY View Models
|
||||
• DTOs never cross into UI components
|
||||
|
||||
⸻
|
||||
|
||||
9. Non-Negotiable Rules
|
||||
• Core has no DTOs
|
||||
• Core has no View Models
|
||||
• API has no View Models
|
||||
• Frontend has no Core Results
|
||||
• View Models exist only in the frontend
|
||||
• Presenters mean different things per layer, but:
|
||||
• Core = Output Port
|
||||
• API = Adapter
|
||||
• Website = Mapper
|
||||
11. Final Merksatz
|
||||
|
||||
⸻
|
||||
Use Cases decide.
|
||||
Application Services orchestrate.
|
||||
Adapters translate.
|
||||
UI presents.
|
||||
|
||||
10. Final Merksatz
|
||||
|
||||
The Core emits results.
|
||||
The API transports them.
|
||||
The Frontend interprets them.
|
||||
|
||||
If a type tries to do more than one of these — it is incorrectly placed.
|
||||
If a class violates more than one of these roles, it is incorrectly placed.
|
||||
115
docs/architecture/FILE_STRUCTURE.md
Normal file
115
docs/architecture/FILE_STRUCTURE.md
Normal file
@@ -0,0 +1,115 @@
|
||||
# File Structure
|
||||
|
||||
## Core
|
||||
|
||||
```
|
||||
core/ # * Business- & Anwendungslogik (framework-frei)
|
||||
├── shared/ # * Gemeinsame Core-Bausteine
|
||||
│ ├── domain/ # * Domain-Basistypen
|
||||
│ │ ├── Entity.ts # * Basisklasse für Entities
|
||||
│ │ ├── ValueObject.ts # * Basisklasse für Value Objects
|
||||
│ │ └── DomainError.ts # * Domain-spezifische Fehler
|
||||
│ └── application/
|
||||
│ └── ApplicationError.ts # * Use-Case-/Application-Fehler
|
||||
│
|
||||
├── racing/ # * Beispiel-Domain (Bounded Context)
|
||||
│ ├── domain/ # * Fachliche Wahrheit
|
||||
│ │ ├── entities/ # * Aggregate Roots & Entities
|
||||
│ │ │ ├── League.ts # * Aggregate Root
|
||||
│ │ │ └── Race.ts # * Entity
|
||||
│ │ ├── value-objects/ # * Unveränderliche Fachwerte
|
||||
│ │ │ └── LeagueName.ts # * Beispiel VO
|
||||
│ │ ├── services/ # * Domain Services (Regeln, kein Ablauf)
|
||||
│ │ │ └── ChampionshipScoringService.ts # * Regel über mehrere Entities
|
||||
│ │ └── errors/ # * Domain-Invariantenfehler
|
||||
│ │ └── RacingDomainError.ts
|
||||
│ │
|
||||
│ └── application/ # * Anwendungslogik
|
||||
│ ├── ports/ # * EINZIGE Schnittstellen des Cores
|
||||
│ │ ├── input/ # * Input Ports (Use-Case-Grenzen)
|
||||
│ │ │ └── CreateLeagueInputPort.ts
|
||||
│ │ └── output/ # * Output Ports (Use-Case-Ergebnisse)
|
||||
│ │ └── CreateLeagueOutputPort.ts
|
||||
│ │
|
||||
│ ├── use-cases/ # * Einzelne Business-Intents
|
||||
│ │ └── CreateLeagueUseCase.ts
|
||||
│ │
|
||||
│ └── services/ # * Application Services (Orchestrierung)
|
||||
│ └── LeagueSetupService.ts # * Koordiniert mehrere Use Cases
|
||||
```
|
||||
|
||||
## Adapters
|
||||
|
||||
```
|
||||
adapters/ # * Alle äußeren Implementierungen
|
||||
├── persistence/ # * Datenhaltung
|
||||
│ ├── typeorm/ # Konkrete DB-Technologie
|
||||
│ │ ├── entities/ # ORM-Entities (nicht Domain!)
|
||||
│ │ └── repositories/ # * Implementieren Core-Ports
|
||||
│ │ └── LeagueRepository.ts
|
||||
│ └── inmemory/ # Test-/Dev-Implementierungen
|
||||
│ └── LeagueRepository.ts
|
||||
│
|
||||
├── notifications/ # Externe Systeme
|
||||
│ └── EmailNotificationAdapter.ts # Implementiert Notification-Port
|
||||
│
|
||||
├── logging/ # Logging / Telemetrie
|
||||
│ └── ConsoleLoggerAdapter.ts # Adapter für Logger-Port
|
||||
│
|
||||
└── bootstrap/ # Initialisierung / Seeding
|
||||
└── EnsureInitialData.ts # App-Start-Logik
|
||||
```
|
||||
|
||||
## API
|
||||
|
||||
```
|
||||
apps/api/ # * Delivery Layer (HTTP)
|
||||
├── app.module.ts # * Framework-Zusammenbau
|
||||
│
|
||||
├── leagues/ # * Feature-Modul
|
||||
│ ├── LeagueController.ts # * HTTP → Application Service
|
||||
│ │
|
||||
│ ├── dto/ # * Transport-DTOs (HTTP)
|
||||
│ │ ├── CreateLeagueRequestDto.ts # * Request-Shape
|
||||
│ │ └── CreateLeagueResponseDto.ts # * Response-Shape
|
||||
│ │
|
||||
│ └── presenters/ # * Output-Port-Adapter
|
||||
│ └── CreateLeaguePresenter.ts # * Core Output → HTTP Response
|
||||
│
|
||||
└── shared/ # API-spezifisch
|
||||
└── filters/ # Exception-Handling
|
||||
```
|
||||
|
||||
## Frontend
|
||||
```
|
||||
apps/website/ # * Frontend (UI)
|
||||
├── app/ # * Next.js Routen
|
||||
│ └── leagues/ # * Page-Level
|
||||
│ └── page.tsx
|
||||
│
|
||||
├── components/ # * Reine UI-Komponenten
|
||||
│ └── LeagueForm.tsx
|
||||
│
|
||||
├── lib/
|
||||
│ ├── api/ # * HTTP-Client
|
||||
│ │ └── LeaguesApiClient.ts # * Gibt NUR API DTOs zurück
|
||||
│ │
|
||||
│ ├── dtos/ # * API-Vertrags-Typen
|
||||
│ │ └── CreateLeagueResponseDto.ts
|
||||
│ │
|
||||
│ ├── commands/ # * Command Models (Form State)
|
||||
│ │ └── CreateLeagueCommandModel.ts
|
||||
│ │
|
||||
│ ├── presenters/ # * DTO → ViewModel Mapper
|
||||
│ │ └── CreateLeaguePresenter.ts
|
||||
│ │
|
||||
│ ├── view-models/ # * UI-State
|
||||
│ │ └── CreateLeagueViewModel.ts
|
||||
│ │
|
||||
│ ├── services/ # * Frontend-Orchestrierung
|
||||
│ │ └── LeagueService.ts
|
||||
│ │
|
||||
│ └── blockers/ # UX-Schutz (Throttle, Submit)
|
||||
│ ├── SubmitBlocker.ts
|
||||
│ └── ThrottleBlocker.ts
|
||||
```
|
||||
Reference in New Issue
Block a user