Models

• Term comes from “MVC” - model, view, controller
• Model is a concept describing a subsystem or part of your overall application
• Often it is a collection of Classes (ruby or otherwise)
• What does the Model do?
  • It encapsulates the application state
  • It responds to queries about the state and requests to update the state
  • It validates those requests to keep the state consistent
  • It contains (almost) no “business logic”
  • It doesn’t interact directly with the user or the outside world
• Where does the model keep the state
  • Most often in a database
  • but not always