EF 7 单向多对多错误：每个跳过导航都必须有一个配置的外键

Question

以下官方文档我以这种方式设置了我的对象，但得到了

OneTimeSetUp: System.InvalidOperationException : The skip navigation 'Contatore.Workflow1' doesn't have a foreign key associated with it. Every skip navigation must have a configured foreign key.

Workflow 类的 Contatori 属性

当我正确添加外键时

public class Workflow
{
    public required int Id { get;  set; }
    public virtual ICollection<Contatore> Contatori { get; set; } = new HashSet<Contatore>();
}

public class Contatore
{
    public override int Id { get; set; }

    public virtual ICollection<Contatore> ContatoriFigli { get; set; } = new HashSet<Contatore>();
    public virtual ICollection<Contatore> ContatoriPadri { get; set; } = new HashSet<Contatore>();
}



internal class ContatoreConfiguration : IEntityTypeConfiguration<Contatore>
{
public void Configure(EntityTypeBuilder<Contatore> builder)
    {
        builder
            .ToTable($"NAT_{Costanti.CodiceApplicazione}_CONTATORE_003")
            .HasKey(c => c.Id)
            .HasName("NAK_DASH_003");

        builder.Property(b => b.Id)
            .HasColumnName("ID_003")
            .HasComment("Chiave primaria")
            .HasDefaultValueSql($"SYUNA{Costanti.CodiceApplicazione}.SEQ_{Costanti.CodiceApplicazione}_003.NEXTVAL");
        
        builder.HasMany(x => x.ContatoriFigli)
            .WithMany(x => x.ContatoriPadri)
            .UsingEntity("NAT_DASH_CONTATORE_LINKS_004",
                m => m.HasOne(typeof(Contatore)).WithMany().HasForeignKey("IdContatorePrincipale").HasPrincipalKey(nameof(Contatore.Id)),
                s => s.HasOne(typeof(Contatore)).WithMany().HasForeignKey("IdContatoreCollegato").HasPrincipalKey(nameof(Contatore.Id)),
                j => {
                    j.Property("IdContatorePrincipale").HasColumnName("ID_CONT_PRINC_004");
                    j.Property("IdContatoreCollegato").HasColumnName("ID_CONT_COLL_004");
                    j.HasKey("IdContatorePrincipale", "IdContatoreCollegato");
                }
            );
    }


internal class WorkflowConfiguration : IEntityTypeConfiguration<Workflow>
{
    public void Configure(EntityTypeBuilder<Workflow> builder)
    {
        builder
            .ToTable($"NAT_DASH_WORKFLOW_005")
            .HasKey(c => c.Id)
            .HasName("NAK_DASH_005");

        builder.Property(b => b.Id)
            .HasColumnName("ID_005")
            .HasComment("Chiave primaria")
            .HasDefaultValueSql($"SYUNA{Costanti.CodiceApplicazione}.SEQ_{Costanti.CodiceApplicazione}_005.NEXTVAL");
               
        builder.HasMany(x => x.Contatori)
            .WithMany()
            .UsingEntity("NAT_DASH_WORKFLOW_CONTATORE_006",
                m => m.HasOne(typeof(Workflow)).WithMany().HasForeignKey("ID_WORKFLOW_006").HasPrincipalKey(nameof(Workflow.Id)),
                s => s.HasOne(typeof(Contatore)).WithMany().HasForeignKey("ID_CONTATORE_006").HasPrincipalKey(nameof(Contatore.Id))

            );
    }

Oracle表：

CREATE TABLE "NAT_DASH_WORKFLOW_CONTATORE_006"
   (    
    "ID_WORKFLOW_006" NUMBER (9,0),
    "ID_CONTATORE_006" NUMBER (9,0), 
    CONSTRAINT NAF_DASH_006_004 FOREIGN KEY (ID_WORKFLOW_006) REFERENCES NAT_DASH_WORKFLOW_005 (ID_005),
    CONSTRAINT NAF_DASH_006_005 FOREIGN KEY (ID_CONTATORE_006) REFERENCES NAT_DASH_CONTATORE_003 (ID_003)
    );

Answer 1

好像对顺序比较敏感，将

Workflow

配置改为：

builder.HasMany(x => x.Contatori)
    .WithMany()
    .UsingEntity("NAT_DASH_WORKFLOW_CONTATORE_006",
        s => s.HasOne(typeof(Contatore)).WithMany().HasForeignKey("ID_CONTATORE_006").HasPrincipalKey("Id"),
        m => m.HasOne(typeof(Workflow)).WithMany().HasForeignKey("ID_WORKFLOW_006").HasPrincipalKey("Id")
    );