upsert method

@override Future<void> upsert(String table, Map<String, dynamic> data)

Inserts the row if no row with the same id exists, otherwise patches the existing row with the keys in data. Soft-delete column on data is honoured (the engine uses upsert to apply pulled tombstones).

Caller supplies all sync metadata fields; the adapter does not populate them. Atomic with respect to transaction.

Added in 0.2.0 for the engine's pull pipeline.

Implementation

@override
Future<void> upsert(String table, Map<String, dynamic> data) async {
  final rows =
      _tables.putIfAbsent(table, () => <String, Map<String, dynamic>>{});
  final id = data[SyncColumns.id] as String;
  if (rows.containsKey(id)) {
    rows[id]!.addAll(data);
  } else {
    rows[id] = Map<String, dynamic>.from(data);
  }
}