I'm starting with ef core - code first, and I have simple asp.net console app im which I have 3 tables and 1 join table for many to many relationship. This is how tables looks like:
public class Kupac
{
public int Id { get; set; }
public String Ime { get; set; }
public String Prezime { get; set; }
public List<Racun> Racuni { get; set; }
}
public class Proizvod
{
public int Id { get; set; }
public String Naziv { get; set; }
public float Cijena { get; set; }
public List<ProizvodRacun> ProizvodRacun { get; set; }
}
public class ProizvodRacun
{
public int ProizvodId { get; set; }
public Proizvod Proizvod { get; set; }
public int RacunId { get; set; }
public Racun Racun { get; set; }
public int Kolicina { get; set; }
}
public class Racun
{
public int Id { get; set; }
public List<ProizvodRacun> ProizvodRacun { get; set; }
public int? KupacId {get; set;}
public Kupac Kupac { get; set; }
public bool Active { get; set; }
}
I know that I should use ICollection instead of List but that's not problem right now I think. I have some data in tables "Kupac(Customer)" and "Proizvod(Product)". When I try to add something in this join table - "ProizvodRacun" I use this code:
using (MyContext context = new MyContext())
{
Kupac kupacc = context.Kupci.SingleOrDefault(k => k.Id == 2);
Proizvod proizvod = context.Proizvodi.SingleOrDefault(p => p.Id == 5);
Racun racun = new Racun();
racun.Kupac = kupacc;
ProizvodRacun proizvodRacun = new ProizvodRacun();
proizvodRacun.Proizvod = proizvod;
proizvodRacun.Racun = racun;
proizvodRacun.Kolicina = 5;
context.Add(proizvodRacun);
context.SaveChanges();
}
And this works! But when I try to do the same thing in other way navigation properties are not added, but records in tables are!! The other way is this:
Racun racun = null;
Kupac tempKupac = null;
ProizvodRacun proizvodRacun = new ProizvodRacun();
tempKupac = context.Kupci.SingleOrDefault(k => k.Id == kupac.Id);
if (tempKupac != null)
{
if (tempKupac.Racuni != null)
{
racun = context.Racuni.SingleOrDefault(r => r.Active == true);
if (racun != null)
{
proizvodRacun.Racun = racun;
context.Add(proizvodRacun);
context.SaveChanges();
}
else
{
racun = new Racun();
racun.Active = true;
racun.Kupac = tempKupac;
racun.ProizvodRacun = new List<ProizvodRacun>();
proizvodRacun.Racun = racun;
context.Add(proizvodRacun);
context.SaveChanges();
}
}
else
{
//FIRST TIME THIS CODE GET EXECUTED SO JUST WATCH THIS CASE
racun = new Racun();
racun.Kupac = tempKupac;
proizvodRacun.Proizvod = context.Proizvodi.SingleOrDefault(p => p.Id == products[i].Id);
proizvodRacun.Kolicina = j;// j -> option from code above that can't be seen...
proizvodRacun.Racun = racun;
context.Add(proizvodRacun);
context.SaveChanges();
}
}
else
{
Console.WriteLine("Customer doesn't exist!");
}
Please help me ...
Ok I found problem, I had to use .Include()
when I queried "Kupac" , to include its "Racun"s. The "Racun" was always there just it wasn't loaded.
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