save method

@override Future<Change?> save(String key, Record record)

Adds or updates the model at a given key in the Source.

Implementation

@override
Future<Change?> save(String key, Record record) async {
  var existing = box.get(key);
  if (existing == record) {
    return null;
  } else if (existing == null) {
    await box.put(key, record);
    return Added(key, record);
  } else {
    await box.put(key, record);
    return Updated(key, record);
  }
}