Question

我有4个表要与它们建立关系。

模型1类别

public partial class Categories
    {
        public Categories()
        {
            AssetTypes = new HashSet<AssetTypes>();
            CategoryComponents = new HashSet<CategoryComponents>();
            Items = new HashSet<Items>();
        }
    public int CategoryId { get; set; }
    public DateTime? Deletedon { get; set; }
    public string Name { get; set; }
    public DateTime CreatedOn { get; set; }

    public virtual ICollection<AssetTypes> AssetTypes { get; set; }
    public virtual ICollection<CategoryComponents> CategoryComponents { get; set; }
    public virtual ICollection<Items> Items { get; set; }
}

这是Model 2类别组件

public partial class CategoryComponents
    {
        public CategoryComponents()
        {
            AssetComponents = new HashSet<AssetComponents>();
        }

    public int Id { get; set; }
    public string Name { get; set; }
    public int CategoryId { get; set; }

    public virtual Categories Category { get; set; }
    public virtual ICollection<AssetComponents> AssetComponents { get; set; }
}

模型3“资产类型”

public partial class AssetTypes
    {
        public AssetTypes()
        {
            AssetComponents = new HashSet<AssetComponents>();
            Checkins = new HashSet<Checkins>();
        }

        public int Id { get; set; }
        public string Type { get; set; }
        public string AssetName { get; set; }
        public int AssetStatus { get; set; }
        public string ImagePath { get; set; }
        public int VendorId { get; set; }
        public int CategoryId { get; set; }
        public DateTime CreatedOn { get; set; }
        public DateTime? DeletedOn { get; set; }
        public string Description { get; set; }
        public bool? ActiveStatus { get; set; }
        public int SubCategoryId { get; set; }
        public decimal Price { get; set; }

        public virtual Categories Category { get; set; }
        public virtual SubCategory SubCategory { get; set; }
        public virtual Vendors Vendor { get; set; }
        public virtual AssetTracks AssetTracks { get; set; }
        public virtual ICollection<AssetComponents> AssetComponents { get; set; }
        public virtual ICollection<Checkins> Checkins { get; set; }
    }

模型4“ AssetComponents”

 public partial class AssetComponents
    {
        public int Id { get; set; }
        public string Value { get; set; }
        public int AssetTypeId { get; set; }
        public string Note { get; set; }
        public int CategoryComponentId { get; set; }

        public virtual AssetTypes AssetType { get; set; }
        public virtual CategoryComponents CategoryComponent { get; set; }
    }

添加迁移后出现错误

在表'AssetComponents'上引入FOREIGN KEY约束'FK_AssetComponents_CategoryComponents_CategoryComponentId'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。

public virtual DbSet<Categories> Categories { get; set; }
public virtual DbSet<CategoryComponents> CategoryComponents { get; set; }
public virtual DbSet<AssetComponents> AssetComponents { get; set; }
public virtual DbSet<AssetTypes> AssetTypes { get; set; }

任何人都可以为我建立一个数据库。

我想接受任何身体反应。如果我想念直到我一样的东西

Answer 1

您可以考虑将Restrict onDelete添加为一种行为。

 modelBuilder.HasOne(x => x....).WithMany(op => op.....).IsRequired()
            .HasForeignKey(@"FkId").OnDelete(DeleteBehavior.Restrict);

Answer 2

对于CategoryComponents和AssetComponents之间的关系，这是一对多关系。

尝试将public int CategoryComponentId { get; set; }更改为public int? CategoryComponentId { get; set; }，以解决此错误。

如何为具有关系的多个表创建迁移。

2 个答案: