public async Task <IActionResult> Create(int PizzaId, List <int> NewIngredients)
{
if (ModelState.IsValid)
{
var oldIngredients = _context.PizzaIngredients.Where(m => m.PizzaId == PizzaId).Select(m => m.IngredientId).ToList();
List <int> deleteIngredientsIds = oldIngredients.Except(NewIngredients).ToList();
List <PizzaIngredient> toDelete = _context.PizzaIngredients.Where(m => m.PizzaId == PizzaId && deleteIngredientsIds.Contains(m.IngredientId)).ToList();
List <int> addIngredientsIds = NewIngredients.Except(oldIngredients).ToList();
List <PizzaIngredient> toAdd = new List <PizzaIngredient>();
foreach (int i in addIngredientsIds)
{
toAdd.Add(new PizzaIngredient {
PizzaId = PizzaId, IngredientId = i
});
}
_context.RemoveRange(toDelete);
_context.AddRange(toAdd);
await _context.SaveChangesAsync();
return(RedirectToAction("Index", "Pizzas"));
}
ViewData["PizzaId"] = new SelectList(_context.Pizzas.Where(x => x.Id == PizzaId), "Id", "Name");
return(View());
}