GraphQL: Inline Fragment on Array Fields (#5908)

* Inline Fragment Spec

* Inline Fragment on Arrays

* Fix Test

* Only select the root field

* Requested Changes

* Lazy Loaded ArrayResult

src/GraphQL/parseGraphQLUtils.js

@@ -12,3 +12,30 @@ export function toGraphQLError(error) {
   }
   return new ApolloError(message, code);
 }
+
+export const extractKeysAndInclude = selectedFields => {
+  selectedFields = selectedFields.filter(
+    field => !field.includes('__typename')
+  );
+  let keys = undefined;
+  let include = undefined;
+  if (selectedFields && selectedFields.length > 0) {
+    keys = selectedFields.join(',');
+    include = selectedFields
+      .reduce((fields, field) => {
+        fields = fields.slice();
+        let pointIndex = field.lastIndexOf('.');
+        while (pointIndex > 0) {
+          const lastField = field.slice(pointIndex + 1);
+          field = field.slice(0, pointIndex);
+          if (!fields.includes(field) && lastField !== 'objectId') {
+            fields.push(field);
+          }
+          pointIndex = field.lastIndexOf('.');
+        }
+        return fields;
+      }, [])
+      .join(',');
+  }
+  return { keys, include };
+};