Created
May 5, 2019 22:49
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(defn ref->ident | |
"Sometimes references on the client are actual idents and sometimes they are | |
nested maps, this function attempts to return an ident regardless." | |
[x] | |
(cond | |
(eql/ident? x) x | |
(map? x) (some #(and (= "id" (name (first %))) (into [] %)) x) | |
:else nil)) | |
(defn delta->datomic-txn | |
"Takes in a normalized form delta, usually from client, and turns in | |
into a datomic transaction." | |
[delta] | |
(mapcat (fn [[[id-k id] entity-diff]] | |
(conj | |
(mapcat (fn [[k diff]] | |
(let [{:keys [before after]} diff] | |
(cond | |
(ref->ident after) (if (nil? after) | |
[[:db/retract (str id) k (ref->ident before)]] | |
[[:ucv.fn/add-ident (str id) k (ref->ident after)]]) | |
(and (sequential? after) (every? ref->ident after)) | |
(let [before (into #{} | |
(comp (map ref->ident) (remove nil?)) | |
before) | |
after (into #{} | |
(comp (map ref->ident) (remove nil?)) | |
after) | |
retracts (set/difference before after) | |
adds (set/difference after before) | |
eid (str id)] | |
(vec | |
(concat | |
(for [r retracts] [:db/retract eid k r]) | |
(for [a adds] [:ucv.fn/add-ident eid k a])))) | |
:else (if (nil? after) | |
[[:db/retract (str id) k before]] | |
[[:db/add (str id) k after]])))) | |
entity-diff) | |
{id-k id :db/id (str id)})) | |
delta)) |
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