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Lessons

How to add Lazy Load Hooks to Rails Plugins

May 05, 2025

To provide clean integrations with Rails plugins, we can use lazy load hooks to add callbacks for when classes are loaded.

17m

Unread Messages Indicators

Apr 28, 2025 Pro

Continuing on in our chat app with Hotwire, we are going to be implementing the ability to indicate to users that they have unread messages in conversations.

15m

Dynamic CSS For User Specific Styling

Apr 21, 2025 Pro

Let's look at how to apply CSS to the current user only to create a better UX for reading messages without using any JavaScript

13m

How to Debug Ubuntu and Debian Packages

We spend most of our time working with Ruby gems and node modules, but on the rare occasion, we might need to debug an Ubuntu / Debian package. In this lesson, we'll see how these packages work and debug something in the PostgreSQL package.

11m

How to use CodeMirror with ImportMaps

Apr 07, 2025

Learn how to use the CodeMirror editor in your browser using Importmaps.

11m

Refactoring Madmin Pagination

Mar 31, 2025 Pro

In this lesson, we dive into the Pagy source code to learn how to best refactor pagination inside of our own code.

17m

A Simpler Build with Broadcasts Refreshes

Mar 26, 2025 Pro

In this episode, we refactor our code to use broadcasts_refreshes to get an extremely simplified version of a chat application.

Where Any? vs Exists?

Mar 17, 2050 Pro

In this lesson, we will look at using the exists? method from active record to check if any records are returned from a query just like with using .where(..).any? but without the overhead of loading all of the records into memory.

21m

Stimulus Autoscroll and Broadcasting Messages

Mar 10, 2025 Pro

We handle scrolling the most recent message into view upon page load along with any new messages that come through while on the page. We also broadcast new messages so everyone stays up to date.

23m

Message Form Handling with Stimulus

Mar 03, 2025 Pro

We take care of submitting a message without having to click the form button, and fix an issue we create in doing so around replacing the form. We end with planning our next steps.

24m

Handling New Messages with Turbo Streams

Feb 24, 2025 Pro

We explore the base application and create a turbo stream to append messages and reset the form. We then identify limitations in this approach, and outline necessary improvements for upcoming episodes.

Structured Output with Gemini 2.0

Feb 17, 2025 Pro

Like many AI models, Gemini 2.0 can respond with structured output in a JSON schema that you provide in your request. This is incredibly handy for making integrations that don't have to rely on parsing a blob of text.

15m

AI Summaries in Rails with Gemini 2.0

Feb 10, 2025 Pro

AI summaries are in every application these days. In this lesson, we'll use Google's new Gemini 2.0 AI model and API to generate summaries of text that we can use in any Ruby or Rails app.

12m

Lazy Requiring Dependencies in Ruby

Feb 03, 2025 Pro

Normally, we require dependencies at the top of files, but today we'll see where and when we might want to lazily require dependencies.

Hash Fetch with Default Value

Jan 27, 2025 Pro

In this screencast, we explore Ruby's Hash#fetch method and how it handles default values. We show how providing a direct default value vs a block affects performance, especially important in Rails apps where unnecessary operations can impact speed.