Top 10 Errors From 1000+ Ruby on Rails Projects (and How to Avoid Them)

To give back to the developer community, at Rollbar we looked at our database of thousands of projects and found the top 10 errors in Ruby on Rails projects. We’re going to show you what causes them and how to prevent them from happening. If you avoid these “gotchas," it’ll make you a better developer.
Because data is king, we collected, analyzed, and ranked the top 10 Ruby errors from Ruby on Rails applications. Rollbar collects all the errors for each project and summarizes how many times each one occurred. We do this by grouping errors according to fingerprinting. Basically, we group two errors if the second one is just a repeat of the first. This gives users a nice overview instead of an overwhelmingly big dump like you’d see in a log file.

Link: https://dzone.com/articles/top-10-errors-from-1000-ruby-on-rails-projects-and