Have you ever seen Ruby bugs? I recently did. Surprisingly, it happened during my Rails upgrade for a giant monolith. My first impression was confusion. I have never seen Ruby bugs before. But Ruby is another program that great engineers built. …

I’m working on a Rails upgrade for a giant monolith application. It’s been a while already, and while I’m encountering many issues trying to jump from 5.2+ right to 6.1, I want to share some of the stories. You may know that Rails 6 has introduced a new application loader…

I recently stumbled upon a perplexing discrepancy while converting Time to DateTime using the #to_datetime method. Intrigued by this unexpected behavior, I delved into an investigation to unravel its root cause. I’ll share my findings in this blog post with you, as I believe it’s worth your attention. Introduction I’m currently…

Since the beginning of Ruby on Rails, there have been no built-in solutions for organizing controllers and business logic. I witness engineers/companies still doing the same CRUD controllers that Rails scaffolding shows them to do. While this might be a good approach in some cases, in my experience, most times…

Recently, I published an article about “Stop using manual preloading in your Rails application; use this instead.” Many people were interested, but I failed to explain the ultimate solution. Considering that I still see posts about ActiveRecord includes, I want to elaborate on the idea deeply. If you haven’t read…

It’s a popular internet recommendation to use preloading in Ruby on Rails applications to eliminate the N+1 query problem. It may seem like a blessing initially, but it has drawbacks. Gladly, there is a much better solution I want to share with you. Before we dive into the ultimate solution…

I was suddenly doing a simple task to generate a bunch of random integers. There were no strict requirements, so I was thinking about an upper bound I could put. My gut advised me to come up with a number that could represent various numbers at a reasonable cost. …

When dealing with has_one associations in the Ruby on Rails ORM framework ActiveRecord, there is a tiny but essential detail. This missing point brought a severe issue in one of the projects I worked on. Unfortunately, resolving the issue afterward took much more work than preventing it from happening. Therefore…

This story is about a problem of uniqueness validation in ActiveRecord (Ruby on Rails default ORM). Even though the issue is quite common, most available guidelines provide incomplete solutions. That is why I want to share how to deal with the problem and ensure it does not come back. Feel…