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This is an interesing bug I've encountered this week. While our Rails application was working in development it was completely broken in UAT environment (which is 99% production like)
We were getting
Circular dependency detected while autoloading constant error on all of our reports.
NewRelic service is great for application monitoring and errors tracking. However it doesn't track rake exceptions by default. You can use AirBrake gem and service, but sometimes it's too much for you. Fortunately with a bit of ruby it's easy to do it yourself.
Today was trying to figure out why my query was running very and very slow.