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#big-models

Topics

• Rails vs OOP – #rails-vs-oop
• SOLID Principles – #solid #srp
• Data vs Responsibility – #data-centric #responsibility-centric
• Ceremony vs Essence – #ceremony-vs-essence
• The Cost of Indirection – #indirection
• Cohesion – #cohesion
• Testability – #testability
• Rails is a Detail – #rais-is-a-detail

Patterns

• Service Objects
  • External Interfaces
  • Responsibility Objects
  • Query Objects
  • Form Objects
  • Policy Objects
  • Role Objects
  • Use-Case Objects
• Service Layer
• Concerns
• Not–so–skinny Controllers
• PORO Domain Objects
• Repositories
• Presenter Objects
• Value Objects
• Observers
• Callbacks
• Virtual Attributes

Architectures

• DCI
• Hexagonal

Taxonomies

Does the object represent a real-world concept?

• Yes => Model
• No => Service

Who calls the object?

• The Controller (i.e outside the domain layer)
  • Controllers not allowed to models? => Service Layer
• Another domain object (model or service)

How objects relate to each other?

• Collaboration (Services)
  • Composition
  • Aggregation / Association
  • Dependency
• Augmentation
  • Extension (Static, Dynamic) (Concerns, DCI Roles)
  • Decoration (Presenters, DCI Roles)