更新数据库错误 - 没有任何外键的表上的外键约束

Question

我有两张桌子Product＆amp; ProductCategory。当我在包管理器控制台中执行add-migration时，一切正常，但是当我运行update-database时，我收到的错误是无关紧要的：

  

在表'ProductCategories'上引入FOREIGN KEY约束'FK_ProductCategories_Products_ProductId'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。无法创建约束或索引。查看以前的错误

其他人对此问题的不同之处在于我的ProductCategory表中不包含任何外键。

ProductCategory.cs

public class ProductCategory : DomainModel<int>
{
    [Required, StringLength(256)]
    public string Name { get; set; }

    [MaxLength]
    public string Description { get; set; }

    [Required]
    [DefaultValue(false)]
    public bool VisibleToCustomerPublicAccount { get; set; }

    [Required]
    [DefaultValue(true)]
    public bool RequireApproval { get; set; }

    public string Thumbnail { get; set; }

    [Required]
    [DefaultValue(false)]
    public bool Inactive { get; set; }
}

Product.cs

[Table("Products")]
public class Product : DomainModel<int>
{
    public int ProductCategoryId { get; set; }

    [ForeignKey("ProductCategoryId")]
    public virtual ProductCategory ProductCategory { get; set; }

    [Required, StringLength(256)]
    public string Title { get; set; }

    [Required, DefaultValue(false)]
    public bool AllowEdit { get; set; }

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

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

    public int? SupplierId { get; set; }

    [ForeignKey("SupplierId")]
    public virtual Supplier Supplier { get; set; }

    [Column(TypeName = "numeric(5,2)")]
    public decimal SalesTaxRate { get; set; }

    public int? PressId { get; set; }

    [ForeignKey("PressId")]
    public virtual Press Press { get; set; }

    [MaxLength]
    public string Thumbnail { get; set; }

    [MaxLength]
    public string Description { get; set; }

    [MaxLength]
    public string Artwork { get; set; }

    [MaxLength]
    public string Colour { get; set; }

    [MaxLength]
    public string Delivery { get; set; }

    [MaxLength]
    public string Material { get; set; }

    [MaxLength]
    public string Finishing { get; set; }

    [MaxLength]
    public string Proofs { get; set; }

    [MaxLength]
    public string Packing { get; set; }

    [MaxLength]
    public string Notes { get; set; }

    [MaxLength]
    public string TermsAndInstructions { get; set; }

    [StringLength(128)]
    public string ShortDescription { get; set; }

    [MaxLength]
    public string ItemDescription { get; set; }

    [MaxLength]
    public string PrintReadyFile { get; set; }

    [Required, DefaultValue(false)]
    public bool VisibleToCustomerPublicAccount { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowShortDescription { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowItemDescription { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowPriceStartFrom { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowPriceList { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowPriceSubtotalTax { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowPrintReadyFile { get; set; }

    [Required, DefaultValue(false)]
    public bool AllowUserToUploadArtworkFile { get; set; }

    public int NumberOfUploadBoxes { get; set; }

    [Required, DefaultValue(false)]
    public bool MakeFirstFileUploadMandatory { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowStock { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowSoldInPacks { get; set; }

    [Required, DefaultValue(false)]
    public bool AllowGroupRun { get; set; }

    [Required, DefaultValue(false)]
    public bool ShowCustomerCode { get; set; }

    [Required ,DefaultValue(false)]
    public bool ShowItemCode { get; set; }

    [Required, DefaultValue(false)]
    public bool HidePricesOfOptions { get; set; }

    [Required, DefaultValue(false)]
    public bool QuickAddFunctionEnabled { get; set; }
}

我在这类问题上看到了很多解决方案，但解决方案并不成立，因为ProductCategory表上没有密钥。