public IQueryable <Core.Data.Bonus> GetCurrentVersionBonuses()
{
var currentIdVersion = Bonuses
.GroupBy(bonus => bonus.Id)
.Select(group => new { Id = group.Key, Version = group.Max(obj => obj.Version) });
return(Bonuses
.Include(bonus => bonus.Statistic)
.Where(bonus => currentIdVersion.Contains(new { bonus.Id, bonus.Version })));
}