Rails

1. Getting Started with Rails

   MVC overview, generating a new app, scaffolding resources, convention over configuration.

2. Rails Routing

   resources, RESTful routes, nested resources, member and collection routes, constraints, and route helpers.

3. Action Controller

   Controller actions, params and strong parameters, sessions, cookies, filters/callbacks, and rendering and redirecting.

4. Layouts and Rendering

   render and redirect_to, layouts, partials, template inheritance, and content_for.

5. Action View Form Helpers

   form_with, model-backed forms, fields_for, nested attributes, and form helpers.

6. Active Record Basics

   ORM conventions, CRUD, naming, schema conventions, and model classes.

7. Active Record Migrations

   Creating and running migrations, schema.rb, rollbacks, and changing tables and columns.

8. Active Record Validations

   Validation helpers, custom validators, conditional validation, and validation errors.

9. Active Record Associations

   belongs_to, has_many, has_one, has_many :through, polymorphic associations, and dependent options.

10. Active Record Query Interface

    where, order, joins, includes (N+1), scopes, calculations, find_each, and eager loading.

11. Active Record Callbacks

    Lifecycle callbacks, before/after hooks, transactions, and callback pitfalls.

12. Active Job

    Background jobs, queue adapters, perform_later, retries, and job scheduling.

13. Action Mailer, Active Storage, Action Cable

    Sending email, file attachments and uploads, and WebSocket channels for real-time features.

14. Caching with Rails

    Fragment caching, Russian doll caching, low-level caching, cache stores, and HTTP caching.

15. Securing Rails Applications

    Sessions, CSRF, SQL injection, XSS, mass assignment, authentication, and credentials.

16. Testing Rails Applications

    Fixtures, model, controller, integration and system tests, and test helpers.

17. Configuring Rails Applications

    Environments, initializers, config options, credentials, and autoloading.

18. API-only Apps and Rails on Rack

    API-only mode, middleware stack, Rack integration, and serialization of JSON responses.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date

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