private UpdateDefinition <AuctionRead> UpdateAuction(AuctionUpdateEventGroup eventGroup,
AuctionBuyNowPriceChanged ev)
{
return(Builders <AuctionRead> .Update.Set(read => read.BuyNowPrice, ev.BuyNowPrice.Value));
}
private void ApplyEvent(AuctionBuyNowPriceChanged ev) => UpdateBuyNowPrice(ev.BuyNowPrice);