public Task <IEnumerable <CommentAggregate> > GetAggregatesAsync(CommentFilter commentFilter)
 {
     return(Task.Run(() => CommentAggregates.AsEnumerable()));
 }
 public Task <CommentAggregate> GetAggregateAsync(long id, int?currentUserAccountId = null)
 {
     return(Task.Run(() => CommentAggregates.FirstOrDefault(x => x.Id == id)));
 }