https://yivanov.com/Practical tech lessons from real projects. I am working day to day with Ruby on Rails and in the mean time I am double majoring in Computer Science and Business Administration. 2026-03-14T23:35:03+02:00 Yoan Ivanov https://yivanov.com/ Jekyll © 2026 Yoan Ivanov /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2026-02-12T11:39:00+02:00 2026-02-12T11:39:00+02:00 https://yivanov.com/posts/don-t-feel-attached-to-your-code/ Yoan Ivanov

Don’t take it personal when someone criticizes your work. It’s not personal(in most cases) and it’s not that deep. I have spent so much time on a feature or a problem, and then in 5 minutes it is ripped apart by someone who understands and knows so much more than me. If you are attached you get too emotional and can’t see the bigger picture. I am always bummed out when I need to delete my prog...

2026-02-02T16:25:00+02:00 2026-02-02T16:25:00+02:00 https://yivanov.com/posts/sidekiq-scheduled-jobs-stopped-running-after-a-gemfile-update/ Yoan Ivanov

After updating my Gemfile to fix a Rails boot error, Sidekiq scheduled jobs silently stopped running despite the process and queues looking healthy. The root cause turned out to be a gem incompatibility that crashed Sidekiq’s scheduler thread on boot, reinforcing the importance of reading errors before changing everything else.

2026-01-28T18:47:00+02:00 2026-01-28T18:47:00+02:00 https://yivanov.com/posts/always-check-user-values/ Yoan Ivanov

A real-life case on why you should never trust the user and always check what they input

2026-01-19T00:00:00+02:00 2026-01-19T00:00:00+02:00 https://yivanov.com/posts/ruby-on-rails-datetime-vs-boolean-database-field/ Yoan Ivanov

Learn why using a datetime instead of a boolean in your Rails models gives you more useful data for almost no extra cost.

2025-12-22T14:35:00+02:00 2025-12-22T14:35:00+02:00 https://yivanov.com/posts/ruby-on-rails-fixing-cannot-load-such-file-rails-cli-loaderror/ Yoan Ivanov

Error Rails doesn’t work. We get a require: cannot load such file -- rails/cli (LoadError) > rails <internal:/usr/share/rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:37:in `require': cannot load such file -- rails/cli (LoadError) from <internal:/usr/share/rvm/rubies/ruby-3.2.2/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:37:in `require' from...