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(require '[clojure.set :as set]) | |
(def info | |
[{:year 2017 | |
:month 4 | |
:data "x"} | |
{:year 2017 | |
:month 4 | |
:data "y"} | |
{:year 2017 | |
:month 7 | |
:data "z"}]) | |
(def db (reduce | |
(fn [db fact] | |
(merge-with into db | |
(set/index [fact] [:entity]) | |
(set/index [fact] [:entity :attribute]) | |
(set/index [fact] [:entity :attribute :value]) | |
(set/index [fact] [:attribute]) | |
(set/index [fact] [:attribute :value]) | |
(set/index [fact] [:value]))) | |
{} | |
(for [m info | |
:let [id (java.util.UUID/randomUUID)] | |
[k v] m] | |
{:entity id | |
:attribute k | |
:value v}))) | |
(for [{:keys [entity attribute value]} (get db {:attribute :month :value 4}) | |
{data :value} (get db {:entity entity :attribute :data})] | |
[entity data]) | |
;;=> ([#uuid "8ce5aaea-e633-4972-b8ef-3202680b2f6f" "y"] [#uuid "08d3e0ec-c08b-492e-b638-86fb2e932a93" "x"]) |
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