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