Entity Framework 核心
执行更新数据库时抛出错误
错误:-
在表 'UserRoleRelationship' 上引入 FOREIGN KEY 约束 'FK_UserRoleRelationship_UserRoels_ParentUserRoleId' 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。
public class UserRoleRelationship
{
[Key]
public int Id { get; set; }
[Required]
public Guid UserRoleRelationshipId { get; set; }
public virtual UserRole ChildUserRole { get; set; }
public int ChildUserRoleId { get; set; }
public virtual UserRole ParentUserRole { get; set; }
public int ParentUserRoleId { get; set; }
}
public class UserRole
{
[Key]
public int Id { get; set; }
[Required]
public Guid UserRoleId { get; set; }
public virtual Role Role { set; get; }
public int RoleId { set; get; }
public virtual U.User User { set; get; }
public int UserId { set; get; }
}
最佳答案
对于您当前的模型设计,它将在下面创建迁移:
migrationBuilder.AddForeignKey(
name: "FK_UserRoleRelationship_UserRole_ChildUserRoleId",
table: "UserRoleRelationship",
column: "ChildUserRoleId",
principalTable: "UserRole",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
migrationBuilder.AddForeignKey(
name: "FK_UserRoleRelationship_UserRole_ParentUserRoleId",
table: "UserRoleRelationship",
column: "ParentUserRoleId",
principalTable: "UserRole",
principalColumn: "Id",
onDelete: ReferentialAction.Cascade);
FK_UserRoleRelationship_UserRole_ChildUserRoleId
和 FK_UserRoleRelationship_UserRole_ParentUserRoleId
两者都将删除 UserRole
中的记录删除时 UserRoleRelationship
这将导致多个级联删除。如需解决方法,请尝试制作
int
如 int?
像下面这样: public int? ParentUserRoleId { get; set; }
这将创建
migrationBuilder.AddForeignKey(
name: "FK_UserRoleRelationship_UserRole_ParentUserRoleId",
table: "UserRoleRelationship",
column: "ParentUserRoleId",
principalTable: "UserRole",
principalColumn: "Id",
onDelete: ReferentialAction.Restrict);
备注
您需要删除
UserRole
首先,然后删除 UserRoleRelationship
关于entity-framework - ...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,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52268985/