Dart APIunself_local_databaseFieldoptions options property Null safety TextColumn options Implementation TextColumn get options => text().nullable()(); unself_local_database unself_local_database Field options property Field class Constructors Field Properties collectionId customConstraints dontWriteConstraints hashCode id isStrict name options primaryKey required runtimeType system tableName type unique uniqueKeys withoutRowId Methods blob boolean dateTime int64 integer intEnum noSuchMethod real text textEnum toString Operators operator ==