Presentation Layer

The Presentation Layer transforms application responses into output formats (HTML, JSON) and handles HTTP concerns.

In This Section

• Presenters - Transform QueryResponse to ViewModel
• View Models - Structured data for templates
• HTTP Responses - Response building patterns
• Twig Integration - Template rendering

Layer Responsibilities

• Transform QueryResponse objects into ViewModels
• Apply display formatting (badges, dates, CSS classes)
• Render templates via Twig
• Build HTTP responses with proper headers

Data Flow

QueryResponse → Presenter → ViewModel → Template → HTTP Response

Key Patterns

Presenter Pattern: Transform domain data into display-ready formats. Presenters apply formatting, calculate display values, and prepare CSS classes.

Multiple Output Formats: The same QueryResponse can have different presenters for HTML and JSON output.

PresentationContext: Provides user permissions to presenters for conditional display (show/hide buttons based on permissions).