Upgrading Rails applications to Tailwind 4 - With the TailwindCSS 4 beta out, I decided to upgrade my Rails applications. Here are the steps I took to do the upgrade^*:

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Ruby On Rails Resources I Use Every Day - Here are a few sites/resources I have bookmarked that I refer to day to day when coding Ruby on Rails applications.

• https://api.rubyonrails.org
• https://guides.rubyonrails.org
• https://github.com/rails/rails
• https://railsdiff.org

Install Ruby 3.1 with ASDF -

Installing Ruby 2.6.7 on MacOS with asdf - On MacOS Big Sur - installing Ruby 2.6.7 may fail during the compilation step. Here is the snippet I used to ensure it compiles and installs.

Execution order of after_commit and after_rollback ActiveRecord callback - Rails allows the adding of various callbacks that trigger during the lifecycle of an ActiveRecord operation. The standard callbacks are before_validation, after_validation, before_save, before_create, after_create, after_save, after_commit, and after_rollback.

These are documented quite extensively in the Rails Guides and the Rails API documentation.

The documentation is quite good at showing you the order the callbacks are executed - eg before_validation fires before validate which fires before before_save etc. Most of these validations execute in the order they are defined. For example, if you have two before_save callbacks defined, then they will execute one after the other.

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Rails, testing, and peace of mind - I must admit, I probably didn’t test my code as thoroughly as I ought to have. Let me re-phrase that. I did test it. I just didn’t write complete test cases to ensure regressions weren’t introduced when new bits were added. As a result, maintenance always took longer than it should have, and bugs were introduced when changes were made. Even though I had read and studied the importance of testing very early in my software development career, it was only after continued frustration with things breaking that I got off my butt and actually started using testing practices like TDD, BDD and even writing tests for code that had already been written. I made it a goal to have the code as covered as possible.

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