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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.
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.
If we want to add realtime tracking of which users are online, we can use active websocket connections through ActionCable to keep track.
Learn how to test ActiveStorage file uploads and create fixtures with ActiveStorage attachments
Testing file uploads can be tricky, but Shrine makes both file uploading and testing a lot easier than you might expect.
Webpacker provides some nice tools for loading Javascript in several different ways. We're looking at require.context to see how to load an entire directory's set of files easily.
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.
Scroll events in Javascript can happen quickly. We want to make sure we don't request the same page multiple times which we can solve easily by introducing a little throttling.
An updated version of our Group Chat series using Webpacker, ActionCable, Stimulus.js, and modern Javascript to build a very clean version of realtime group chat in Rails
Using the Intersection Observer API, we can refactor our infinite scroll example to be much more efficient and simpler to use
Keeping track of a user's last read timestamp for each chat room is straightforward, especially when we use Stimulus.js to update it from the client side.
Webpack bundles can be confusing as to what actually ships in production. Using the bundle analyzer plugin, we can visualize and see exactly what libraries and files are taking up what space.
Contribute to Rails by discovering something you could improve and learning how to add features to Rails
One fantastic way to improve Rails performance is by using Etags to help the browser keep track if a page has changed or not. This can help Rails skip rendering views entirely and save lots of time.
It's important to see that there are unread messages in channels you're not actively viewing. We can use a very simple event in ActionCable to do this and bold channel names with unread messages.
User mentions in group chat is a crucial feature, so this week we're taking a look at how to add @ mentions for our users in chat with regex and more.
Building a gem can be complicated. Often times you're writing abstract, meta code so it can be used flexibly in situations you'll never imagine. We'll talk about the architecture and design of the noticed gem and how it all works.
Row-level multitenancy is an easy, scalable approach to restricting access to data in your application between tenants. Using the acts_as_tenant gem, we can enforce this automatically throughout our Rails applications.
It's a common situation that we need to submit complex data in our forms in our Rails apps. We'll explore how can we transform the simple values browser forms allow and convert them into something Rails can use and transform into Ruby objects.
Flash messages are typically a simple string saying something succeeded or failed. What if we wanted to add buttons like you see in most applications? It's easier than you might think!
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