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| (defn group-by-many | |
| "Like `group-by', but allows grouping by multiple keys. | |
| Example: | |
| (group-by-many [{:a 1 :b 2 :c 3} {:a 7 :b 12 :c -4}] [:a :c]) | |
| >>> {#{1 3} {:a 1 :b 2 :c 3} #{7 -4} {:a 7 :b 12 :c -4}} | |
| " | |
| [ks m] | |
| (let [f (fn [x] | |
| {(-> x (select-keys ks) vals set) x})] | |
| (apply merge (map f m)))) |
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