public static OrderItemDto ToDto(this OrderItemEntity entity)
        {
            var dto = new OrderItemDto
            {
                Id    = entity.Id,
                Drink = entity.Drink.ToDto(),
                AdditionalIngredients = entity.AdditionalIngredients.Select(ai => ai.ToDto()).ToList()
            };

            return(dto);
        }
        public static OrderItemEntity ToEntity(this OrderItemDto dto)
        {
            var entity = new OrderItemEntity
            {
                Id    = dto.Id,
                Drink = dto.Drink.ToEntity(),
                AdditionalIngredients = dto.AdditionalIngredients.Select(ai => ai.ToEntity()).ToList()
            };

            return(entity);
        }