Datascript sample

ds.clj

(ns clj-wb.ds
  (:require [datascript.core :as d]))

(let [schema {:tags {:db/cardinality :db.cardinality/many}}
      conn (d/create-conn schema)]
  (d/transact! conn [{:db/id 1 
                      :name "John Doe"
                      :status :ok
                      :tags ["cplusplus" "java"]}
                      {:db/id 2
                       :name "Mark Doe"
                       :status :ko
                       :tags ["clojure" "python" "ruby"]}
                      {:db/id 97
                       :address "Baker Street, 14"
                       :who 1}
                      {:db/id 98
                       :address "Pedroneras, 24"
                       :who 2}])
  ;; db/id is the datom entity. person -> db/id
  (d/q '[:find ?person ?name ?address
         :where 
         [?person :name ?name]
         [?data :who ?person]
         [?data :address ?address]]
       @conn))