$projectionToJson method

Map<String, Object>? $projectionToJson()

$projection转换为Map格式数据

Implementation

Map<String, Object>? $projectionToJson() {
  if ($projection != null) {
    return {for (var element in $projection!) element._name: element._value$projection ?? DBUnsupportNullValue('\$projection', element._name)};
  }
  return null;
}