How to build a complete, real-world application from scratch with Ruby on Rails step by step.
A lot of Ruby code is "magic". We'll explain the magic and see how it works using the powerful tools Ruby gives us.
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Using the Intersection Observer API, we can refactor our infinite scroll example to be much more efficient and simpler to use
Sometimes you might want to keep track of all classes a module was included in. We can do that with a couple nifty tricks to make this work with both regular Ruby modules and Rails concerns.
Testing file uploads can be tricky, but Shrine makes both file uploading and testing a lot easier than you might expect.
Learn how to test ActiveStorage file uploads and create fixtures with ActiveStorage attachments
If we want to add realtime tracking of which users are online, we can use active websocket connections through ActionCable to keep track.
Mocks are a handy tool for writing tests in Ruby. You can use them to fake an object and verify that the correct methods were called against it. Perfect for testing a method that integrates closely with another class or module.
Test stubs are very handy when you want to mock out the response to a method call. This allows your tests to be more reliable and skip long running or unnecessary method calls.
Today we're refactoring Andrew Mason's GitHub Action that runs Rubocop against your repository. We'll pull out some concepts, remove conditionals, and use several other techniques to clean up the code.
Testing ActionCable authentication with Devise is pretty easy, especially when we build our own helpers to stub out Warden
Rails provides several really useful test helpers for ActionMailer so we can quickly iterate on our design, test that our code queues up the right emails, and make sure our emails contain the right content.
Testing integrations with external APIs in your Rails app can be hard. You don't know what requests are being made (or even the responses), so how can you properly mock them out? VCR to the rescue.
WebMock is a fantastic way to stub out and mock your HTTP requests. It will actually throw an exception in your test suite when an HTTP request is made so that you know when you're hitting an external API that you haven't stubbed out correctly.
Learn how to write integration tests in Rails to test controllers and actions
You can use Fixtures in Rails to create sample database records for your tests to run against. They're easy to setup and extremely quick.
Test Driven Development, or TDD, is a pretty simple process that allows you to write your code in conjunction with tests to ensure a high level of confidence and code coverage.
Race conditions can cause problems with data integrity. We can prevent these issues with Pessimistic Locking in ActiveRecord which uses database row-level locking.
When things (users, jobs, etc) attempt to update the same record at the same time, we can often lose changes. Optimistic locking uses a lock version number to warn you about updating stale objects so you can handle that safely.
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