Dart APIunself_local_databaseCollectionDatacreated created property Null safety DateTime created final Implementation final DateTime created; unself_local_database unself_local_database CollectionData created property CollectionData class Constructors CollectionData fromJson Properties created createRule deleteRule extra hashCode id listRule name runtimeType system type updated updateRule viewRule Methods copyWith noSuchMethod toColumns toCompanion toJson toJsonString toString Operators operator ==