我在尝试在Entity Framework Core上映射多对多关系时遇到错误，我的多对多类需要有一个额外的字段 .
以下是实体：
public class RelatedProfession
{
public int ProfessionId { get; set; }
public virtual Profession Profession { get; set; }
public int SimilarProfessionId { get; set; }
public virtual Profession SimilarProfession { get; set; }
public double Similarity { get; set; }
}
public class Profession
{
[Key]
public int Id { get; set; }
public List<RelatedProfession> RelatedWith { get; set; }
public List<RelatedProfession> SimilarWith { get; set; }
}
我的fluentApi映射：
modelBuilder.Entity<RelatedProfession>()
.HasKey(p => new { p.ProfessionId, p.SimilarProfessionId });
modelBuilder.Entity<RelatedProfession>()
.HasOne(p => p.SimilarProfession)
.WithMany(p => p.SimilarWith)
.HasForeignKey(p=> p.SimilarProfessionId)
.OnDelete(DeleteBehavior.Restrict);
modelBuilder.Entity<RelatedProfession>()
.HasOne(p => p.Profession)
.WithMany(p => p.RelatedWith)
.HasForeignKey(p => p.ProfessionId)
.OnDelete(DeleteBehavior.Restrict);
modelBuilder.Entity<Profession>()
.HasMany(p => p.RelatedWith)
.WithOne(p => p.Profession)
.HasForeignKey(p=> p.ProfessionId)
.OnDelete(DeleteBehavior.Restrict);
modelBuilder.Entity<Profession>()
.HasMany(p => p.SimilarWith)
.WithOne(p => p.SimilarProfession)
.HasForeignKey(p => p.SimilarProfessionId)
.OnDelete(DeleteBehavior.Restrict);
当我试图跑
dotnet ef migrations add xxxxx
和
dotnet ef database update
我收到以下消息错误：
在表'RelatedProfessions'上引入FOREIGN KEY约束'FK_RelatedProfessions_Professions_SimilarProfessionId'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 .