当键在基类中时,EF迁移DropForeignKey失败

Question

我正在尝试更新EF 5.0.0-rc代码优先类库的数据模型.Up()方法中的第一个命令是

DropForeignKey("dbo.ChileInventory", new[] { "LotInventoryItemTypeId", "ChileProductId" }, "dbo.ChileProducts");

但我得到一个SqlException:'FK_dbo.ChileInventory_dbo.ChileProducts_LotInventoryItemTypeId_ChileProductId'不是约束.无法删除约束.

我认为错误的原因是因为我的ChileProducts类从它的基类得到了它的关键属性.由于DropForeignkey方法没有接受主列名称的重载,我相信EF无法确定要删除的正确约束.我还应该指出,异常消息中显示的约束名称与数据库中的约束名称不匹配(因此错误...)

您可以在下面找到数据模型和迁移方法.但首先要快速了解迁移背后的变化性质:InventoryBase类的每个衍生产品都通过InventoryTypeId和[InventoryTypeSpecific] ProductId的组合键定义产品类型.例如,ChileInventory会将其特定的智能类型类型识别为InventoryItemTypeId = [ChileInventoryTypeId]和ChileProductId = [ChileProductId].PackagingInventory会将其包装类型标识为InventoryItemTypeId = [PackagingInventoryTypeId]和PackagingProductId = [PackagingProductId].等等.

我正在努力推出的模型更改是将[InventoryTypeSpecific] ProductId从每个InventoryBase衍生产品升级到基础.这将导致所有InventoryBase派生对象共享一个公共ProductId属性,该属性与InventoryItemTypeId一起将启用从InventoryBase到ProductBase的导航; 这在以前的型号中是不可能的.

在此先感谢您的建议和考虑.--Vinney

数据模型

智利产品

public abstract class ProductBase
{
    [Key]
    [Column(Order = 0)]
    public virtual int InventoryItemTypeId { get; set; }

    [Key]
    [Column(Order = 1)]
    public virtual int Id { get; set; }

    [StringLength(150)]
    public virtual string Name { get; set; }

    [ForeignKey("InventoryItemTypeId")]
    public virtual InventoryItemType InventoryItemType { get; set; }

    public virtual bool IsActive { get; set; }
}
public class ChileProduct : ProductBase
{
    public virtual int ChileTypeId { get; set; }

    [ForeignKey("ChileTypeId")]
    public virtual ChileType ChileType { get; set; }
}

智利库存

public abstract class InventoryBase
{
    [Key]
    [Column(Order = 0, TypeName = "Date")]
    public virtual DateTime DateCreated { get; set; }

    [Key]
    [Column(Order = 1)]
    public virtual int Sequence { get; set; }

    [Key]
    [Column(Order = 2)]
    public virtual int LotInventoryItemTypeId { get; set; }

    [Column(TypeName = "Date")]
    public virtual DateTime LotDateCreated { get; set; }

    public virtual int LotSequence { get; set; }

    public virtual int ProductId { get; set; }

    [ForeignKey("LotInventoryItemTypeId, LotDateCreated, LotSequence")]
    public virtual Lot Lot { get; set; }

    [ForeignKey("LotInventoryItemTypeId")]
    public virtual InventoryItemType ItemType { get; set; }

    public virtual ICollection<InventoryQuantityByLocation> QuantitiesByLocation { get; set; }

    [ForeignKey("LotInventoryItemTypeId, ProductId")]
    public virtual ProductBase ProductBase { get; set; }
}

public class ChileInventory : InventoryBase
{
    [Column(TypeName = "Date")]
    public virtual DateTime? ProductionBatchDateCreated { get; set; }

    public virtual int? ProductionBatchSequence { get; set; }

    public virtual int PackagingInventoryItemTypeId { get; set; }

    public virtual int PackagingProductId { get; set; }

    [ForeignKey("ProductionBatchDateCreated, ProductionBatchSequence")]
    public virtual ProductionBatch ProductionBatch { get; set; }

    [ForeignKey("LotInventoryItemTypeId, ProductId")]
    public virtual ChileProduct ChileProduct { get; set; }

    [ForeignKey("PackagingInventoryItemTypeId, PackagingProductId")]
    public virtual PackagingProduct PackagingProduct { get; set; }

}

移民

public override void Up()
    {
        DropForeignKey("dbo.ChileInventory", new[] { "LotInventoryItemTypeId", "ChileProductId" }, "dbo.ChileProducts");
        DropForeignKey("dbo.PackagingInventory", new[] { "LotInventoryItemTypeId", "PackageId" }, "dbo.PackagingProducts");
        DropForeignKey("dbo.AdditiveInventory", new[] { "LotInventoryItemTypeId", "AdditiveProductId" }, "dbo.AdditiveProducts");
        DropIndex("dbo.ChileInventory", new[] { "LotInventoryItemTypeId", "ChileProductId" });
        DropIndex("dbo.PackagingInventory", new[] { "LotInventoryItemTypeId", "PackageId" });
        DropIndex("dbo.AdditiveInventory", new[] { "LotInventoryItemTypeId", "AdditiveProductId" });
        AddColumn("dbo.Inventory", "ProductId", c => c.Int(nullable: false));
        AddForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts", new[] { "InventoryItemTypeId", "Id" });
        AddForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts", new[] { "InventoryItemTypeId", "Id" });
        AddForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts", new[] { "InventoryItemTypeId", "Id" });
        AddForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts", new[] { "InventoryItemTypeId", "Id" });
        CreateIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        CreateIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        CreateIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        CreateIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        DropColumn("dbo.ChileInventory", "ChileProductId");
        DropColumn("dbo.PackagingInventory", "PackageId");
        DropColumn("dbo.AdditiveInventory", "AdditiveProductId");
    }

    public override void Down()
    {
        AddColumn("dbo.AdditiveInventory", "AdditiveProductId", c => c.Int(nullable: false));
        AddColumn("dbo.PackagingInventory", "PackageId", c => c.Int(nullable: false));
        AddColumn("dbo.ChileInventory", "ChileProductId", c => c.Int(nullable: false));
        DropIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        DropIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        DropIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        DropIndex("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" });
        DropForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts");
        DropForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts");
        DropForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts");
        DropForeignKey("dbo.Inventory", new[] { "LotInventoryItemTypeId", "ProductId" }, "dbo.AdditiveProducts");
        DropColumn("dbo.Inventory", "ProductId");
        CreateIndex("dbo.AdditiveInventory", new[] { "LotInventoryItemTypeId", "AdditiveProductId" });
        CreateIndex("dbo.PackagingInventory", new[] { "LotInventoryItemTypeId", "PackageId" });
        CreateIndex("dbo.ChileInventory", new[] { "LotInventoryItemTypeId", "ChileProductId" });
        AddForeignKey("dbo.AdditiveInventory", new[] { "LotInventoryItemTypeId", "AdditiveProductId" }, "dbo.AdditiveProducts", new[] { "InventoryItemTypeId", "Id" });
        AddForeignKey("dbo.PackagingInventory", new[] { "LotInventoryItemTypeId", "PackageId" }, "dbo.PackagingProducts", new[] { "InventoryItemTypeId", "Id" });
        AddForeignKey("dbo.ChileInventory", new[] { "LotInventoryItemTypeId", "ChileProductId" }, "dbo.ChileProducts", new[] { "InventoryItemTypeId", "Id" });
    }

Answer 1

这是我找到的一项工作:

使用DropForeignKey重载,其中包含参数principalName和name - 在本例中为约束名称!它有点脆弱,因为它需要事先知道约束名称,但它按预期工作.

Answer 2

如果您的初始模型是使用 EF 4.3 创建的，那么您将在 EF 5.0 中出现此类错误，因为生成 PK/FK 约束名称的规则在这两个版本的 EF 之间发生了变化。

有关详细信息和另一种可能的解决方案，请参阅此问题。