Top 10 errors from 1000+ Ruby on Rails projects (and how to avoid them)
Link: Top 10 errors from 1000+ Ruby on Rails projects (and how to avoid them): "We looked at our database of thousands of projects and found the top 10 Ruby on Rails errors. We’re going to show you what causes them and how to prevent them from happening. If you avoid these "gotchas," you can be a better, and bug free Rails developer."