Quick question (I think). I have a collection of maps. Each map will contain the same 2 keys, but different values. I’d like to merge those maps by one key and group the other key’s values into a vector.

Likely better explained here: https://www.refheap.com/111477

I’m sure there must be some elegant way using merge or merge-with or something similar to accomplish this, but I’m hitting a wall.

given this:

({:id 1, :title "Star Wars"} {:id 1, :title "Indiana Jones"} {:id 1, :title "E.T."} {:id 2, :title "Rocky”})

return this:

({:id 1, :title ["Star Wars" "Indiana Jones" "E.T."]} {:id 2, :title ["Rocky"]})

http://conj.io/store/v1/org.clojure/clojure/1.7.0/clj/clojure.core/group-by/

That might be what you’re after.

oooh! That definitely gets me much closer!

thanks

You bet.

i should be able to finish it from there

i knew there was likely something built in and elegant. I was going to write a huge function and map it over the collection

this ended up getting me the result I was looking for

(->> '({:id 1 :title "Star Wars"} {:id 1 :title "Indiana Jones"} {:id 1 :title "E.T."} {:id 2 :title "Rocky"})
           (group-by :id)
           (map (fn [[k v]] {:id k :titles (mapv :title v)})))