[英]Entity Framework multiple relationships/navigations to entity type
我想在ASP.NET Core中創建此數據庫架構:
我已經用此代碼嘗試過了,但沒有成功。
用戶
public class User : IdentityUser
{
public override string Id { get; set; }
public virtual UserVisitors Visitors { get; set; }
}
UserVisitors
public class UserVisitors
{
public int Id { get; set; }
public string UserId { get; set; }
public string UserVisitorId { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public DateTime VisitTime { get; set; }
[ForeignKey("UserId")]
public virtual User User { get; set; }
[ForeignKey("UserVisitorId")]
public virtual User UserVisitor { get; set; }
}
我在遷移時遇到此錯誤:
無法確定類型為“ UserVisitors”的導航屬性>“ User.Visitors”所表示的關系。 手動配置>關系,或使用'[NotMapped]'屬性或> OnModelCreating中的'EntityTypeBuilder.Ignore'忽略此屬性。
我希望有一個人可以幫助我。 提前致謝。
更新:
將UserVisitors
更改為:
public class UserVisitors
{
public int Id { get; set; }
[InverseProperty("User")]
public string UserId { get; set; }
[InverseProperty("User")]
public string UserVisitorId { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public DateTime VisitTime { get; set; }
public virtual User User { get; set; }
}
列UserVisitorId
不必關系User.UserID
。
public class User : IdentityUser
{
public override string Id { get; set; }
public virtual ICollection<UserVisitor> UserVisitors { get; set; }
public virtual ICollection<UserVisitor> UserVisitors2 { get; set; }
}
public class UserVisitor
{
public int Id { get; set; }
[InverseProperty("User")]
public string UserId { get; set; }
public virtual User User {get; set;}
public virtual User UserVisitor {get; set;}
[InverseProperty("User")]
public string UserVisitorId { get; set; }
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public DateTime VisitTime { get; set; }
public virtual User User { get; set; }
}
然后,您需要使用OnModelCreatig
進行正確的映射,如下所示:
modelBuilder.Entity<UserVisitor>()
.HasOne(x => x.UserVisitor)
.WithMany(x => x.UserVisitors)
modelBuilder.Entity<UserVisitor>()
.HasOne(x => x.User)
.WithMany(x => x.UserVisitors2)
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