deleteAllExcept<_Model extends T> method

Future<bool> deleteAllExcept<_Model extends T>({ required Query query, })

The convenient inverse of deleteAll. query defines the instances that should not be deleted. Return value reflects if the operation completed without any failures.

It is strongly recommended to use Equatable or to override the == operator in your app's models when incorporating this method. A delta between models to keep and models to remove is computed with ==.

Implementation

Future<bool> deleteAllExcept<_Model extends T>({required Query query}) async {
  final allModels = await get<_Model>();
  final modelsToKeep = await get<_Model>(query: query);
  final modelsToDelete = allModels.where((m) => !modelsToKeep.contains(m));

  var allDeletesSuccessful = true;
  for (final model in modelsToDelete) {
    final didDelete = await delete<_Model>(model, query: query);
    if (!didDelete) allDeletesSuccessful = false;
  }

  return allDeletesSuccessful;
}