datomic entity resolution exploration

gistfile1.txt

(def db-uri "datomic:mem://minimal-example")

(d/create-database db-uri)

(def conn (d/connect db-uri))

(def schema
  [   {:db/ident :day
       :db/unique :db.unique/identity
       :db/valueType :db.type/long
       :db/cardinality :db.cardinality/one}
  {:db/ident :metric/day
      :db/unique :db.unique/identity
      :db/valueType :db.type/ref
      :db/cardinality :db.cardinality/one}
   {:db/ident :rev
    :db/valueType :db.type/double
    :db/cardinality :db.cardinality/one}     ])

@(d/transact conn schema)
;; till here setup.

;; 1 does not work: create automatically the metric entity and the day entity. 
@(d/transact conn [{:metric/day {:day 3} :rev 1.1}])

;; 2 does work: first create day entity and then auto create metric entity.
@(d/transact conn [{:day 3} ])
@(d/transact conn [{:metric/day [:day 3] :rev 1.1}])
(d/q '[:find
       (pull ?e [*])
       :where
       (or [?e :rev]
           [?e :day])]
     (d/db conn))

;; 3 also works: first create metric entity and then auto create day entity.
@(d/transact conn [{ :rev 1.1}])
(def eid (d/q '[:find
                ?e .
                :where
                [?e :rev]]
              (d/db conn)))

@(d/transact conn [{:db/id eid :metric/day {:day 3}}])

(d/q '[:find
       (pull ?e [*])
       :where
       (or [?e :rev]
           [?e :day])]
     (d/db conn))

(d/release conn)

;; conclusion: I have to be mindful of how I transact data into datomic cause it's not as smart as I hoped it would be