Schema Modifications

Adding a field

Fields can contain parameters, such as specifying the timezone to use when converting a timestamp to a local time.

final class TimestampSchemaModule extends SchemaModule {

  @SchemaModification(addField = "iso", onType = Timestamp.class)
  String isoString(Timestamp timestamp) {
    return Instant.ofEpochSecond(timestamp.getSeconds()).toString();
  }

  @SchemaModification(addField = "localTime", onType = Timestamp.class)
  String localTime(Timestamp timestamp, @Arg("timezone") String timezone) {
    return Instant.ofEpochSecond(timestamp.getSeconds()).atZone(ZoneId.of(timezone)).toString();
  }
}

Removing a field

final class TodoModificationsSchemaModule extends SchemaModule {
  @SchemaModification
  TypeModification removePrivateTodoData =
      Type.find(Todo.getDescriptor()).removeField("privateTodoData");
}