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What gems do you use for helping you be more productive or debug more easily while coding in Rails?
Some gems are specific to a task, and you find them easily when you need to implement the feature. With this question, I’m looking for all the others, that you might not think to search for, but once you have heard of it, you install it on each new project.
Please keep one gem per reply, to help the votes sort them out.
For me one of the most useful Rails debug tool is pry. This is something like more feature rich IRB console (we have access to all models, etc) and debugger – we might set break-points, watch variables.