added support for merging vendors.

src/clj/auto_ap/graphql/vendors.clj

@@ -50,4 +50,18 @@
                                  id))
         (->graphql))))
 
+(defn merge-vendors [context {:keys [from to]} value]
+  (let [conn (d/connect uri)
+        transaction (->> (d/query {:query {:find '[?x ?a2]
+                                           :in '[$ ?vendor-from ]
+                                           :where ['[?x ?a ?vendor-from]
+                                                   '[?a :db/ident ?a2]]}
+                                   :args [(d/db conn)
+                                          from]})
+                         (mapcat (fn [[src attr]]
 
+                                   [[:db/retract src attr from]
+                                    [:db/add src attr to]])))
+        transaction (conj transaction [:db/retractEntity from])]
+    @(d/transact conn transaction)
+    to))