message: DS.Model.relationships does not return a property with meta on. Use the
  metaForProperty method instead
diff: @@ -221,7 +221,7 @@ function ownedRelatedRecords(records, out = []) {
  let recordClass = record.constructor;
  get(recordClass, 'relationships').forEach(([ relationshipDefinition ]) => {
  - let { meta } = relationshipDefinition;
  + let meta = recordClass.metaForProperty(relationshipDefinition.name);
  let { owned } = meta.options;
  if (owned) {
  let relatedRecords = record.get(meta.name);
  