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You can use Fixtures in Rai...
Setup your development environment.
Configure your production server.
Learn how to modify production to run websockets.
Track errors in Rails, Sidekiq, etc in production for free using the open source Errbit app and the Airbrake gem
Learn how to analyze and understand the Ruby stacktrace when something goes wrong in your app
See how I discovered and fixed a bug in the Devise open source project
A look at how to supercharge your debugging and solve errors faster than ever
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