implementation-guide.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) - Implementation Guide

Code patterns and Anti-patterns

Entity Relationships

classDiagram
    class Controller {
        +handleRequest()
    }
    class Service {
        +executeBusinessLogic()
    }
    class Model {
        +saveToDatabase()
    }
    class View {
        +render()
    }
    Controller --> Service : delegates
    Controller --> View : chooses
    Service --> Model : manipulates

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Rules for implementation:

1. Thin Controllers: Move all business logic into Service classes.
2. DTOs: Pass Data Transfer Objects between layers to avoid leaking DB schemas.
3. Dependency Injection: Use DI to pass services into controllers for better testability.

Anti-patterns:

• Fat Controllers: Containing raw SQL, business logic, or file system access.
• Logic in Views: Conditional statements that reflect business rules in the UI layer.
• Database Logic in Controllers: Controllers directly calling ORM.find() or similar.