Ruby for Rails: Ruby Techniques for Rails Developers
Fullstack LMS: Ruby on Rails 7, Hotwire, Tailwind, Stripe, PostgreSQL

A framework user’s–eye view of application development

• Describe and model your application’s domain. The domain is the universe of your application. The domain may be music store, university, dating service, address book, or hardware inventory. Whatever it is, you have to figure out what’s in it—what entities exist in this universe—and how the items in it relate to each other. The domain description you come up with will guide the design of your database (which you’ll need to create and initialize using the administrative tools provided by the database system) as well as some of the particulars of the Rails application.
• Specify what can happen in this domain. The domain model is static; it’s just things. Now you have to get dynamic. Addresses can be added to an address book. Musical scores can be purchased from music stores. Users can log in to a dating service. Students can register for classes at a university. You need to identify all the possible scenarios or actions that the elements of your domain can participate in.
• Choose and design the publicly available views of the domain. At this point, you can start thinking in Web-browser terms. Once you’ve decided that your domain has students, and that they can register for classes, you can envi- sion a welcome page, a registration page, and a confirmation page. Cus- tomers shopping for shoes may have access to a style selector, a shopping cart, and a checkout page. Each of these pages, or views, shows the user how things stand at a certain point along the way in one of your domain’s scenarios. You have to decide which views will exist.

Introducing the MVC framework concept

• Model—The parts of the application that define the entities that play a role in the universe of the application (books, hammers, shopping carts, stu- dents, and so on)
• Controller—The facility within the application that directs traffic, on the one hand querying the models for specific data, and on the other hand organiz- ing that data (searching, sorting, massaging it) into a form that fits the needs of a given view
• View—A presentation of data in a particular format, triggered by a control- ler’s decision to present the data

Overview of how Rails implements the MVC framework design

The Basics of Rack for Ruby