C# &引用;引入外键约束“;错误
我有3个主要实体:类别、子类别、产品:C# &引用;引入外键约束“;错误,c#,entity-framework-core,C#,Entity Framework Core,我有3个主要实体:类别、子类别、产品: public class Product { public Product() { Photos = new List<Photo>(); Comments = new List<Comment>(); Colors = new List<ProductColor>(); Attributes = new List<ProductAtt
public class Product
{
public Product()
{
Photos = new List<Photo>();
Comments = new List<Comment>();
Colors = new List<ProductColor>();
Attributes = new List<ProductAttributes>();
}
public int Id { get; set; }
public string ProductName { get; set; }
public string BrandName { get; set; }
public string SellerName { get; set; }
public decimal Price { get; set; }
public bool OnSale { get; set; }
public int SalePercantage { get; set; }
public DateTime DateAdded { get; set; }
public int UnitsInStock { get; set; }
public string MainImageUrl
{
get
{
return Photos.Count > 0 ? Photos[0].PhotoPath : "https://dummyimage.com/600x600/e0d0e0/ffffff.png";
}
}
public decimal ShownPrice
{
get
{
if (OnSale)
{
return SalePrice;
}
else
{
return Price;
}
}
}
public decimal SalePrice
{
get
{
return (decimal)((decimal)Price - ((decimal)Price * ((decimal)SalePercantage / (decimal)100)));
}
}
public bool IsNewBrand
{
get
{
return DateTime.Now.AddDays(-3) <= DateAdded;
}
}
public int SubCategoryId { get; set; }
public SubCategory SubCategory { get; set; }
public List<Photo> Photos { get; set; }
public List<Comment> Comments { get; set; }
public List<ProductColor> Colors { get; set; }
public List<ProductAttributes> Attributes { get; set; }
public List<ProductCategory> ProductCategories { get; set; }
public List<ProductProductSize> ProductSizes { get; set; }
}
public class Category
{
public int Id { get; set; }
public string CategoryName { get; set; }
public List<ProductCategory> ProductCategories { get; set; }
public List<SubCategory> SubCategories { get; set; }
}
public class SubCategory
{
public int Id { get; set; }
public string Name { get; set; }
public List<Product> Products { get; set; }
public int CategoryId { get; set; }
public Category Category { get; set; }
}
当我尝试从PowerShell迁移数据库时,出现以下错误:
在表“ProductCategory”上引入外键约束“FK_ProductCategory_Products_ProductId”可能会导致循环或多个级联路径。指定“删除不操作”或“更新不操作”,或修改其他外键约束。无法创建约束或索引。请参阅前面的错误 我没意识到这个问题,我做错了什么 我的
ProductCategory
实体或类似的东西是否应该有HasOne.with many
代码
我尝试了几乎所有的方法,但仍然找不到解决方案。在产品类别中指定.OnDelete(DeleteBehavior.Restrict)
,如下所示:
modelBuilder.Entity<ProductCategory>()
.HasOne(p => p.Product)
.WithMany(d => d.ProductCategories)
.HasForeignKey(p => p.ProductId)
.OnDelete(DeleteBehavior.Restrict); // <-- Here it is
modelBuilder.Entity<ProductCategory>()
.HasOne(p => p.Category)
.WithMany(d => d.ProductCategories)
.HasForeignKey(p => p.CategoryId)
.OnDelete(DeleteBehavior.Restrict); // <-- Here it is
modelBuilder.Entity()
.HasOne(p=>p.Product)
.WithMany(d=>d.ProductCategories)
.HasForeignKey(p=>p.ProductId)
.OnDelete(DeleteBehavior.Restrict);//p、 (类别)
.WithMany(d=>d.ProductCategories)
.HasForeignKey(p=>p.CategoryId)
.OnDelete(DeleteBehavior.Restrict);// 在ProductCategory
Fluent API配置中指定.OnDelete(DeleteBehavior.Restrict)
,如下所示:
modelBuilder.Entity<ProductCategory>()
.HasOne(p => p.Product)
.WithMany(d => d.ProductCategories)
.HasForeignKey(p => p.ProductId)
.OnDelete(DeleteBehavior.Restrict); // <-- Here it is
modelBuilder.Entity<ProductCategory>()
.HasOne(p => p.Category)
.WithMany(d => d.ProductCategories)
.HasForeignKey(p => p.CategoryId)
.OnDelete(DeleteBehavior.Restrict); // <-- Here it is
modelBuilder.Entity()
.HasOne(p=>p.Product)
.WithMany(d=>d.ProductCategories)
.HasForeignKey(p=>p.ProductId)
.OnDelete(DeleteBehavior.Restrict);//p、 (类别)
.WithMany(d=>d.ProductCategories)
.HasForeignKey(p=>p.CategoryId)
.OnDelete(DeleteBehavior.Restrict);//谢谢你的帮助,它是“WillCascadeOnDelete()”,但改为“OnDelete()”,我不知道,再次感谢。谢谢你的帮助,它是“WillCascadeOnDelete()”,但改为“OnDelete()”,我不知道,再次感谢。