Accept subscription and one-time payments with Stripe in your Rails apps
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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.
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.
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