QueryModifier<OBJ, S> extension Null safety

Extension for QueryBuilders.



optional<RS>(bool enabled, QueryOption<OBJ, S, RS> option) QueryBuilder<OBJ, OBJ, RS>
Only apply a part of the query if enabled is true.
repeat<E, RS>(Iterable<E> items, QueryRepeatModifier<OBJ, S, RS, E> modifier) QueryBuilder<OBJ, OBJ, RS>
Repeatedly apply the query modifier for each item in items.