Imagine the following hypothetical scenario: in a rental property management system, Employee A starts editing contact info for Rental X, adding some extra phone numbers. Around the same time, Employee B notices a typo in the contact info for exactly that Rental X and performs an update. A couple of minutes later, Employee A updates Rental X’s contact info with the new phone numbers, and … the update fixing the typo is now gone! That’s definitely not great!

DynamoDB is a NoSQL database offered by AWS. It can be a great way to avoid adding load to your primary database when you need tens of thousands of reads/writes per second. In this article, Julie Kent walks us through the basics of using DynamoDB with Rails.

The #descendants method is part of Rails. It returns all subclasses that inherit from a given class. In this article, Jonathan Miles shows us how to use this method and how it's implemented. It's a great lesson in the ins and outs of Ruby's object model.

If someone steals your password, they can pretend to be you. That's why many companies provide two-factor or multi-factor authentication via a fingerprint scan, a YubiKey, an authenticator app, or SMS. In this article, Petr Hlavicka will give you a solid foundation of knowledge about multi-factor authentication and will walk you through implementation with Rails, Webauthn, and Devise

Turbo and ActionCable make it a snap to create Rails applications that respond to user behavior in real-time. In this article, Abiodun shows us how to use them together to create a full-featured chat application in Rails.

Hotwire is a way to build modern web applications without much JavaScript by sending HTML over the wire. In this article, Renata Marques introduces us to Hotwire and walks us through a simple example.

Tailwind CSS is a popular CSS framework that helps developers quickly build and style web pages with a unique utility-based approach. Unlike other CSS frameworks, it comes with its own build tooling. In this article, Jeffery Morhous walks us through setting up Tailwind CSS with Rails and Webpacker.

Vue is a popular front-end that is especially useful for Rails developers since it was designed to be incrementally adoptable. That means you can use Vue for parts of your UI without having to rebuild everything from scratch. In this article, John Emmanual will introduce us to Vue, show us how to set it up in Rails, and walk us through a simple project.

Race conditions are arguably the most insidious kind of bug; they're intermittent, subtle, and most likely to occur in production. ActiveRecord's `update_counter` provides us with a convenient way to avoid race conditions when incrementing or decrementing values in the database. In this article, Jonathan Miles shows us how to use it, how it's implemented, and other approaches to avoiding race conditions.

Lambda is an excellent option for deploying lower-traffic web services when you don't want to maintain another server and you want easy access to all of AWS's other services. In this article, Godwin Ekuma shows us step-by-step how to deploy our Rails apps to AWS Lambda.