Dart APIunself_local_databaseFieldCompanionoptions options property Null safety Value<String?> options final Implementation final Value<String?> options; unself_local_database unself_local_database FieldCompanion options property FieldCompanion class Constructors FieldCompanion insert Properties collectionId hashCode id name options required runtimeType system type unique Methods copyWith noSuchMethod toColumns toString Operators operator == Static methods custom