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Definitely check out Pry (http://pry.github.com). It's designed specifically for your use case... Just start Pry, load the gems you want, and then navigate to the method/class you want to know about using Pry's `ls` and `cd` commands. Once you find what you want, either use `show-source` to view the source directly in Pry, or use `edit-method` to open it in an editor.

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