postgresql 多对多映射返回错误

Question

您好，我正在为我当前的映射寻找一些有用的提示。当我尝试添加迁移时，它返回以下错误。我不太确定我做错了什么，或者这不是我应该如何映射它们。

System.Reflection.TargetInvocationException：已抛出异常 通过调用的目标。 ---> System.InvalidOperationException： 无法在“Brokers.ManifestToBrokers”和 'ManifestToBroker.ACASBroker'，因为已经存在关系 在“Brokers.ManifestToBrokers”和“ManifestToBroker.ABIBroker”之间。 导航属性只能参与单个关系。

我有 3 个表，Manifest、ManifestToBroker、经纪人。

public class Manifest
{
    public virtual ManifestToBroker ManifestToBroker { get; set; }
    .......other stuff
}

public class ManifestToBroker
{
    public virtual Manifest Manifest { get; set; }

    public int ManifestId { get; set; }

    public int? ABIFilerId { get; set; }

    public int? ACASFilerId { get; set; }

    public int? AMSFilerId { get; set; }

    public virtual Brokers ABIBroker { get; set; }

    public virtual Brokers ACASBroker { get; set; }

    public virtual Brokers AMSBroker { get; set; }
}

public class Brokers
{
    [StringLength(32)]
    [Required(AllowEmptyStrings = false)]
    public string Name { get; set; }

    [StringLength(50)]
    public string Description { get; set; }

    [StringLength(100)]
    public string Contacts { get; set; }

    [Required]
    public int BrokerType { get; set; }

    [Required]
    public bool SupportABI { get; set; }

    [Required]
    public bool SupportACAS { get; set; }

    [Required]
    public bool SupportAMS { get; set; }

    public virtual ICollection<ManifestToBroker> ManifestToBrokers { get; set; } = new List<ManifestToBroker>();
}

为简单起见，我已将所有映射放在 ManifestToBrokerMapper 中。

public class ManifestToBrokerMapping : IntKeyBaseBaseEntityConfiguration<ManifestToBroker>
{
    protected override void ConfigureThis(EntityTypeBuilder<ManifestToBroker> builder)
    {
        builder.HasKey(m => m.Id);
        builder.HasOne(m => m.ABIBroker)
            .WithMany(m => m.ManifestToBrokers)
            .HasForeignKey(m => m.ABIFilerId);
        builder.HasOne(m => m.ACASBroker)
            .WithMany(m => m.ManifestToBrokers)
            .HasForeignKey(m => m.ACASFilerId);
        builder.HasOne(m => m.AMSBroker)
            .WithMany(m => m.ManifestToBrokers)
            .HasForeignKey(m => m.AMSFilerId);
        builder.HasOne(m => m.Manifest)
            .WithOne(m => m.ManifestToBroker)
            .IsRequired();
        builder.HasIndex(m => new { m.ManifestId, m.ABIFilerId }).IsUnique();
        builder.HasIndex(m => new { m.ManifestId, m.ACASFilerId }).IsUnique();
        builder.HasIndex(m => new { m.ManifestId, m.AMSFilerId }).IsUnique();
    }
}

Answer 1

发现问题，brokers表还需要包含每个ManifestToBroker

public virtual ICollection<ManifestToBroker> ABIFilerMTB { get; set; } = new List<ManifestToBroker>();

public virtual ICollection<ManifestToBroker> ACASFilerMTB { get; set; } = new List<ManifestToBroker>();

public virtual ICollection<ManifestToBroker> AMSFilerMTB { get; set; } = new List<ManifestToBroker>();