update xrefs parser

app/models/entities/Drug.scala

@@ -140,17 +140,18 @@ object Drug {
 
   private val drugTransformerXRef: Reads[JsObject] = __.json.update(
     /*
-    The incoming Json has an cross reference object with an array for each source. We don't know in advance which drug
-    has which references, so we need to flatten the object into an array of objects for conversion into case classes.
-    See: https://www.playframework.com/documentation/2.6.x/ScalaJsonTransformers
+    The incoming Json has an array of cross reference objects with a struct of "key" for the source and "value" for the reference.
+    We don't know in advance which drug has which references.
      */
     __.read[JsObject]
       .map { o =>
         if (o.keys.contains("crossReferences")) {
-          val cr: Seq[(String, JsValue)] = o.value("crossReferences").as[JsObject].fields.to(Seq)
-          val newJsonObjects: Seq[JsObject] =
-            cr.map(xref => JsObject(Seq("source" -> JsString(xref._1), "reference" -> xref._2)))
-          (o - "crossReferences") ++ Json.obj("crossReferences" -> newJsonObjects)
+          val replaceKeys = o.value("crossReferences").as[JsArray].value.map { x =>
+            val source = x.as[JsObject].value("key").as[String]
+            val reference = x.as[JsObject].value("value")
+            JsObject(Seq("source" -> JsString(source), "reference" -> reference))
+          }
+          (o - "crossReferences") ++ Json.obj("crossReferences" -> replaceKeys)
         } else {
           o
         }