Dart APIunself_local_databaseCollectiondeleteRule deleteRule property Null safety TextColumn deleteRule Implementation TextColumn get deleteRule => text().nullable()(); unself_local_database unself_local_database Collection deleteRule property Collection class Constructors Collection Properties created createRule customConstraints deleteRule dontWriteConstraints extra hashCode id isStrict listRule name primaryKey runtimeType system tableName type uniqueKeys updated updateRule viewRule withoutRowId Methods blob boolean dateTime int64 integer intEnum noSuchMethod real text textEnum toString Operators operator ==