data-flow.md

technology	MVC
domain	Architecture
level	Senior/Architect
version	Latest
tags	mvc architecture best-practices architecture
ai_role	Senior MVC Expert
last_updated	2026-03-29

Model-View-Controller (MVC) - Data Flow

Request and Event Lifecycle

sequenceDiagram
    participant User
    participant Router as Router
    participant Controller as Controller
    participant Service as Service
    participant Database as Database
    participant View as View

    User->>Router: HTTP Request (e.g. GET /users)
    Router->>Controller: Route to handler
    Controller->>Service: Delegate business logic
    Service->>Database: Query data
    Database-->>Service: Return data
    Service-->>Controller: Return processed DTO
    Controller->>View: Render with DTO
    View-->>User: HTTP Response (HTML/JSON)

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Constraints

• Unidirectional request flow: User -> Controller -> Service -> DB -> View -> User.
• Controller orchestrates, it does not contain business logic.
• View is pure presentation and rendering.