Entity Framework: Entities in * participate in the * relationship

Question

I'm working with Entity Framework CF and i have weird problem,

Entities in 'StoreContext.Coolers' participate in the
'Cooler_PCParts' relationship. 0 related 'Cooler_PCParts_Target' were found. 1 'Cooler_PCParts_Target' is expected.

In StoreInitializer Cooler is first and that's why shows the error with it, but when i change positions and eg Discs are first it shows the error with Disc_PCParts property.

my PCParts Initializer:

var pcparts = new List<PCParts>
            {
                new PCParts { PCPartsID = 1, ElectronicID= 3, Name= "Chłodzenie"},
                new PCParts { PCPartsID = 2, ElectronicID= 3, Name= "Dyski"},
                new PCParts { PCPartsID = 3, ElectronicID= 3, Name= "Karty dźwiękowe"},
                new PCParts { PCPartsID = 4, ElectronicID= 3, Name= "Karty Graficzne"},
                new PCParts { PCPartsID = 5, ElectronicID= 3, Name= "Kontrolery PCI"},
                new PCParts { PCPartsID = 6, ElectronicID= 3, Name= "Napędy optyczne"},
                new PCParts { PCPartsID = 7, ElectronicID= 3, Name= "Obudowy Komputera"},
                new PCParts { PCPartsID = 8, ElectronicID= 3, Name= "Pamięć RAM"},
                new PCParts { PCPartsID = 9, ElectronicID= 3, Name= "Płyty główne"},
                new PCParts { PCPartsID = 10, ElectronicID= 3, Name= "Procesory"},
                new PCParts { PCPartsID = 11, ElectronicID= 3, Name= "Zasilacze"},

            };

            pcparts.ForEach(o => context.PCParts.AddOrUpdate(o));
            context.SaveChanges();

Cooler Initializer:

var coolers = new List<Cooler>
            {
                new Cooler { CoolerID = 1, PCPartsID = 1, ProducerID = 21, Name = "cooler 80 mm", Warranty = "2 lata", Size = "80 mm", RotationSpeed = "2200 obr./min.", MaxNoise = "23 dB", Tension = "12 V", Dimensions = "80 x 80 x 25 mm", AirFlow = "25", Price = 24.90M }, // ok
                new Cooler { CoolerID = 2, PCPartsID = 1, ProducerID = 21, Name = "cooler 92 mm", Warranty = "2 lata", Size = "92 mm", RotationSpeed = "1800 obr./min.", MaxNoise = "24 dB", Tension = "12 V", Dimensions = "92 x 92 x 25 mm", AirFlow = "25", Price = 12.90M }, //ok
                new Cooler { CoolerID = 3, PCPartsID = 1, ProducerID = 22, Name = "Amber cooler 120 mm - Ultra Cichy", Warranty = "2 lata", Size = "120 mm", RotationSpeed = "1400 obr./min.", MaxNoise = "18 dB", Tension = "12 V", Dimensions = "120 x 120 x 25 mm", AirFlow = "44.8", LifeOfCooler = "80000 godz.", AdditionalFeatures = "łopatki wirnika w kolorze pomarańczowym", Price = 41.90M},//ok
                new Cooler { CoolerID = 4, PCPartsID = 1, ProducerID = 22, Name = "Amber cooler 80 mm - Ultra Cichy", Warranty = "2 lata", Size = "80 mm", RotationSpeed = "1800 obr./min.", MaxNoise = "20 dB", Tension = "12 V", Dimensions = "80 x 80 x 25 mm", AirFlow = "24.4", LifeOfCooler = "80000 godz.", AdditionalFeatures = "łopatki wirnika w kolorze pomarańczowym", Price = 32.90M}, //ok

                new Cooler { CoolerID = 5, PCPartsID = 1, ProducerID = 23, Name = "Dark Blue 120 mm", Warranty = "2 lata", Size = "120 mm", RotationSpeed = "1200 obr./min.", MaxNoise = "22.5 dB", Tension = "12 V", Dimensions = "120 x 120 x 25 mm", AirFlow = "49.21", Price = 25.90M, AdditionalFeatures = "wentylator z niebieskimi diodami" }, //ok
                new Cooler { CoolerID = 6, PCPartsID = 1, ProducerID = 23, Name = "AirGuard 50 mm", Warranty = "2 lata", Size = "50 mm", RotationSpeed = "4500 obr./min.", MaxNoise = "25.84 dB", Dimensions = "50 x 50 x 10 mm", LifeOfCooler = "50000 godz.", AdditionalFeatures = "złącze: 3-Pin Molex", Price = 11.90M }, //ok
                new Cooler { CoolerID = 7, PCPartsID = 1, ProducerID = 23, Name = "AirGuard 92 mm", Warranty = "2 lata", Size = "92 mm", RotationSpeed = "2000 obr./min.", MaxNoise = "25.87 dB", Dimensions = "92 x 92 x 25 mm", LifeOfCooler = "50000 godz.", AdditionalFeatures = "3-Pin Molex", Price = 12.90M }, //ok
                new Cooler { CoolerID = 8, PCPartsID = 1, ProducerID = 24, Name = "Zephyr 60 mm", Warranty = "2 lata", Size = "60 mm", RotationSpeed = "2500 obr./min.", MaxNoise = "17.9 dB", Tension = "12 V", Dimensions = "60 x 60 x 15 mm", AirFlow = "33.66", LifeOfCooler = "50000 godz.", Price = 9.55M }, //ok
                new Cooler { CoolerID = 9, PCPartsID = 1, ProducerID = 24, Name = "Zephyr 140 mm", Warranty = "2 lata", Size = "140 mm", RotationSpeed = "600 obr./min.", MaxNoise = "8.9 dB", Tension = "12 V", Dimensions = "140 x 140 x 25 mm", AirFlow = "47", LifeOfCooler = "50000 godz." , AdditionalFeatures = "Wtyczka 3 pin | W komplecie śrubki + silikonowe podkładki",Price = 19.50M }, //ok

            };

            coolers.ForEach(c => context.Coolers.AddOrUpdate(c));
            context.SaveChanges();

PCParts model:

public class PCParts
    {
        public int PCPartsID { get; set; }
        public int ElectronicID { get; set; }

        public string Name { get; set; }

        public virtual Electronic Electronic { get; set; }
        public virtual ICollection<SoundCard> SoundCards { get; set; }
        public virtual ICollection<Disc> Discs { get; set; }
        public virtual ICollection<Cooler> Coolers { get; set; }
        public virtual ICollection<Graphic> Graphics { get; set; }
        public virtual ICollection<RAM> RAMs { get; set; }
        public virtual ICollection<CPU> CPUs { get; set; }
        public virtual ICollection<ComputerCase> ComputerCases { get; set; }
        public virtual ICollection<Motherboard> Motherboards { get; set; }

    }

Cooler model:

public class Cooler
    {
        public int CoolerID { get; set; }
        public int ProducerID { get; set; }
        public int PCPartsID { get; set; }

        public string Name { get; set; }
        public string Warranty { get; set; }
        public string Size { get; set; }
        public string RotationSpeed { get; set; }
        public string MaxNoise { get; set; }
        public string Tension { get; set; }
        public string Dimensions { get; set; }
        public string AirFlow { get; set; }
        public string AdditionalFeatures { get; set; }
        public string LifeOfCooler { get; set; }
        public decimal Price { get; set; }



        public virtual Producer Producer { get; set; }
        public virtual PCParts PCParts { get; set; }
    }

And in the StoreContext i have sth like this, because my FOREIGN KEY have multiple cascades

        modelBuilder.Entity<Cooler>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<DiscType>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<SoundCard>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<Graphic>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<ComputerCase>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<RAM>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<Motherboard>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);
        modelBuilder.Entity<CPU>().HasRequired(c => c.PCParts).WithMany().WillCascadeOnDelete(false);

Answer 1

Yup i fix that. My problem was that i had bad overloards like @Ivan Stoev said. Everyones now works good and db is updated well. Thank you for help.

My StoreContext file now looks:

modelBuilder.Entity<Laptop>().HasRequired<Electronic>(c => c.Electronic).WithMany(c => c.Laptops).HasForeignKey<int>(c => c.ElectronicID).WillCascadeOnDelete(false);
            modelBuilder.Entity<PC>().HasRequired<Electronic>(c => c.Electronic).WithMany(c => c.PCs).HasForeignKey<int>(c => c.ElectronicID).WillCascadeOnDelete(false);
            modelBuilder.Entity<PCParts>().HasRequired<Electronic>(c => c.Electronic).WithMany(c => c.PCParts).HasForeignKey<int>(c => c.ElectronicID).WillCascadeOnDelete(false);
            modelBuilder.Entity<Network>().HasRequired<Electronic>(c => c.Electronic).WithMany(c => c.Networks).HasForeignKey<int>(c => c.ElectronicID).WillCascadeOnDelete(false);

            modelBuilder.Entity<Cooler>().HasRequired<PCParts>(c => c.PCParts).WithMany(c => c.Coolers).HasForeignKey<int>(c => c.PCPartsID);
            modelBuilder.Entity<DiscType>().HasRequired<PCParts>(c => c.PCParts).WithMany(c => c.DiscTypes).HasForeignKey<int>(c => c.PCPartsID);
            modelBuilder.Entity<SoundCard>().HasRequired<PCParts>(c => c.PCParts).WithMany(c => c.SoundCards).HasForeignKey<int>(c => c.PCPartsID);