Dart APIunself_local_databaseCollectionDatatype type property Null safety CollectionType type final Implementation final CollectionType type; unself_local_database unself_local_database CollectionData type 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 ==