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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 objects?

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

What technique is used to interact?

• 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)

Types of domain concepts I can model?

• Entities
• Relationships
• Roles
• Behaviours
• Processes
• Boundaries