34: Matt Machuga - Dealing with Dependencies in Active Record Models

Topics include:

• Are facades and service location automatically bad?
• Are NounVerber classes anti-OO?
• Adding a layer of composition to create domain models with dependencies
• Using method injection for a temporary dependency
• Using optional parameters to improve testability

Code snippets:

• Option 1: Facades/Service Location/Global Access
• Option 2: Moving the responsibility to a new class
• Option 3: Composing a new domain model
• Option 4a: Inject the dependency into the method
• Option 4b: Optional method injection w/global fallback

Links:

• Matt's blog
• "Agent nouns are code smells" by Peter Gillard-Moss
• Nitpick CI, Adam's PSR-2 style checking service
• "Dependency injection is not a virtue" by DHH
• Erie Day of Code, Matt's conference
• Sponsored by Laracasts

Episode source