Efcore: Metadata :: confusing exception when setting up Navigation with shadow FK

[maumar]

repro:

    public class MyContext : DbContext
    {
        public DbSet<Item> Items { get; set; }
        public DbSet<Offer> Offers { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Offer>().HasOne(e => e.Item).WithOne().HasForeignKey("Offer", "ItemId").IsRequired();
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer("Server=.;Database=Repro5377;Trusted_Connection=True;MultipleActiveResultSets=true;");
        }
    }

    public class Offer
    {
        public Guid Id { get; set; }
        public Item Item { get; set; }
        public decimal Price { get; set; }
    }

    public class Item
    {
        public Guid Id { get; set; }
    }

Exception:

System.InvalidOperationException: You are configuring a relationship between 'Offer' and 'Item' but have specified a foreign key on 'Offer'. The foreign key must be defined on a type that is part of the relationship.
at Microsoft.EntityFrameworkCore.Metadata.Builders.ReferenceReferenceBuilder.SetDependentEntityType(String dependentEntityTypeName) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Builders\ReferenceReferenceBuilder.cs:line 237
at Microsoft.EntityFrameworkCore.Metadata.Builders.ReferenceReferenceBuilder2.HasForeignKey(String dependentEntityTypeName, String[] foreignKeyPropertyNames) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Metadata\Builders\ReferenceReferenceBuilder.cs:line 174
at Repro5107.MyContext.OnModelCreating(ModelBuilder modelBuilder) in D:\Projects\Repro5107\Repro5107\Program.cs:line 16
at Microsoft.EntityFrameworkCore.Infrastructure.ModelCustomizer.Customize(ModelBuilder modelBuilder, DbContext dbContext) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\ModelCustomizer.cs:line 8
at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.CreateModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\ModelSource.cs:line 81
at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.<>c__DisplayClass14_0.b__0(Object k) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\ModelSource.cs:line 55
at System.Collections.Concurrent.ConcurrentDictionary2.GetOrAdd(TKey key, Func2 valueFactory)
at Microsoft.EntityFrameworkCore.Infrastructure.ModelSource.GetModel(DbContext context, IConventionSetBuilder conventionSetBuilder, IModelValidator validator) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\ModelSource.cs:line 55
at Microsoft.EntityFrameworkCore.Internal.DbContextServices.CreateModel() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Internal\DbContextServices.cs:line 52
at Microsoft.EntityFrameworkCore.Internal.LazyRef1.get_Value() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Internal\LazyRef.cs:line 32 at Microsoft.EntityFrameworkCore.Internal.DbContextServices.get_Model() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Internal\DbContextServices.cs:line 65 at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServiceCollectionExtensions.<>c.<AddEntityFramework>b__0_4(IServiceProvider p) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\EntityFrameworkServiceCollectionExtensions.cs:line 111 at Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryService.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceLookup.ConstructorCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass12_0.<RealizeService>b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.EntityFrameworkCore.Storage.DatabaseProviderServices.GetService[TService]() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Storage\DatabaseProviderServices.cs:line 57 at Microsoft.EntityFrameworkCore.Storage.Internal.SqlServerDatabaseProviderServices.get_Creator() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore.SqlServer\Storage\Internal\SqlServerDatabaseProviderServices.cs:line 35 at Microsoft.EntityFrameworkCore.Infrastructure.EntityFrameworkServiceCollectionExtensions.<>c.<AddEntityFramework>b__0_11(IServiceProvider p) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\EntityFrameworkServiceCollectionExtensions.cs:line 118 at Microsoft.Extensions.DependencyInjection.ServiceLookup.FactoryService.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.<>c__DisplayClass12_0.<RealizeService>b__0(ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProvider.GetService(Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderExtensions.GetService[T](IServiceProvider provider) at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure1 accessor) in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\AccessorExtensions.cs:line 48
at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.EnsureDeleted() in D:\k\EntityFramework\src\Microsoft.EntityFrameworkCore\Infrastructure\DatabaseFacade.cs:line 67

[maumar]

Note, this scenario works if OnModelCreating is changed to:

modelBuilder.Entity<Offer>().HasOne(e => e.Item).WithOne().HasForeignKey(typeof(Offer).ToString(), "ItemId").IsRequired();

but it's not obvious from the exception that one needs to specify full entity name when setting up the FK.