Fixed problem with $isPersisted not being set on array elements when using ConnectionMode.PLAIN

Author: John Rix

src/graphql/transformer.ts

@@ -176,6 +176,12 @@ export default class Transformer {
             result[key] = parseFloat(data[key]);
           } else if (key.endsWith("Type") && model.isTypeFieldOfPolymorphicRelation(key)) {
             result[key] = pluralize(downcaseFirstLetter(data[key]));
+          } else if (Array.isArray(data[key])) {
+            const relation: Relation | undefined = model.getRelations().get(key);
+            if (relation) {
+              const related: Model | null = Model.getRelatedModel(relation)!;
+              result[key] = this.transformIncomingData(data[key], related, mutation, true);
+            }
           } else {
             result[key] = data[key];
           }