/// <summary>
 /// Update dish data and save changes.
 /// </summary>
 /// <param name="dish">Dish entity</param>
 public void Update(Dish dish)
 {
     _ctx.Entry(dish).State = EntityState.Modified;
     _ctx.SaveChanges();
 }
 /// <summary>
 /// Add dish to db.
 /// </summary>
 /// <param name="dish">Dish entity</param>
 public void Add(Dish dish)
 {
     _ctx.Dishes.Add(dish);
     _ctx.SaveChanges();
 }