private void UpdateDishRating(dishreview dr)
{
var dishrev = context.dishreviews.Where(r => r.Id_Dish == dr.Id_Dish);
dish d = GetDishById(dr.Id_Dish);
if (dishrev.Count() != 0)
{
double average = (double)dishrev.Average(r => r.Mark);
d.Raiting = Convert.ToInt32(Math.Round(average, 0));
}
else
{
d.Raiting = 0;
}
context.SaveChanges();
}