As an application grows in popularity and usage you'll need to scale the application to support your new users and their data. One way in which your application may need to scale is on the database level. In this episode, we look at reading from a replica database while writing to a primary database. We also look at structuring our application top support multiple databases; each containing their own schema.

GoodJob is a multithreaded, Postgres-based, ActiveJob backend for Ruby on Rails.

In this episode, we explore the Campfire code from 37signals' Once product line. We'll install the product and grab the code base to get it up and running on our development environment.

Magic Links is a passwordless authentication method where you receive a emailed link to proceed with signing in. In this episode, we look at swapping out a lot of the core functionalities of Devise with Magic Links as well as alternatives for using this methodology without Devise.

In this episode, we look at setting up our Campfire instance to be deployable with Kamal instead of the Once CLI. This has a few benefits over the standard deployment mechanism if you are going to be tweaking and making your own changes to the Campfire code. We'll also look at taking in the incoming changes from Once to rebase into our Kamal setup.