public static async Task ChangeRangeAsync <TEntity>(this ISink <TEntity> sink, EntityChange change,
IEnumerable <TEntity> entities, CancellationToken cancellationToken, IScheduler scheduler = null)
where TEntity : class
=> await sink.Change(change, entities.ToObservable(scheduler ?? Scheduler.Default))
.Count().ToTask(cancellationToken).ConfigureAwait(false);
public static IObservable <TEntity> Modify <TEntity>(this ISink <TEntity> sink, IObservable <TEntity> entities)
where TEntity : class
=> sink.Change(EntityChange.Modify, entities);
public static IObservable <TEntity> Delete <TEntity>(this ISink <TEntity> sink, IObservable <TEntity> entities)
where TEntity : class
=> sink.Change(EntityChange.Delete, entities);
public static IObservable <TEntity> Change <TEntity>(this ISink <TEntity> sink, EntityChange change,
IObservable <TEntity> entities)
where TEntity : class
=> sink.Change(entities.Select(e => new { e, change }).GroupBy(x => x.change, x => x.e))
.Select(x => x.Entity);