Generally, I think RubyMine is quite good as a Ruby IDE. You can also use IRb, Ruby's REPL, and #source_location to find definitions, it works for monkeypatche

Generally, I think RubyMine is quite good as a Ruby IDE. You can also use IRb, Ruby's REPL, and #source_location to find definitions, it works for monkeypatches as well if your team is using those.