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https://github.com/yzh44yzh/practical_erlang/blob/master/09_gen_server/lesson_09.md
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def filter_by_koob_id(query, koob_id) do
query
|> join(:inner, [c], j in Jeem, on: j.ext_user_id == c.external_id)
|> where([c, j], j.koob_id == ^koob_id)
end