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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

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

Taxonomies

Who calls the domain object?

• The Controller
  • Controllers only allowed to call services? => Service Layer
• Other domain objects (composition, dependency)

Types of domain objects

• Entities

  • Static / Stateful
  • Real world concept / Problem realm
  • e.g. User, Company, Project

• Roles

  • Dynamic / Stateless
  • Real world concept / Problem realm
  • e.g. Commenter, SourceAccount

• Behaviour

  • Dynamic / Stateless
  • Abstract concept / Solution realm
  • e.g. Query, Policy, Form, Command, UseCase, Logger, Publisher

What technique is used?

• Decoration (e.g. Presenters)
• Composition (e.g. has_one Objects, PORO models)
• Dependency (e.g. Services)
• Extension (dynamic or static) (e.g. DCI Roles or Concerns)

What represents the service object?

• Responsibility objects
• Role objects
• External interfaces
• Use case objects