I have a Ruby array
我有一个Ruby数组
> list = Request.find_all_by_artist("Metallica").map(&:song)
=> ["Nothing else Matters", "Enter sandman", "Enter Sandman", "Master of Puppets", "Master of Puppets", "Master of Puppets"]
> list = Req
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Ruby:如何对Ruby数组进行分组?
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