asp.net-mvc - 违反了多重性约束。数据库优先 EF 4.1

Question

我有以下模型：

我运行以下命令来添加一个新用户：

    using (var context = new CamelotDB())
    {
        Console.WriteLine("Creating Test User");
        DomainEntity userToAdd = new DomainEntity()
        {
            EntityName = "Test User",
            EntityType = DomainEntity.eEntityType.User,
            EntityCreationDate = DateTime.Now,
            EntityLastUpdateDate = DateTime.Now,
            EntityCreatorUserID = 0,
            Creator = context.DomainEntities.Find(0),
            EntityUpdaterUserID = 0,
            Updater = context.DomainEntities.Find(0),
            EntityParentID = null,
            UserDetails = new User()
            {
                Username = "TestUser",
                Password = "123",
                Email = "TestUser@Test.org",
                FirstName = "Test",
                LastName = "User",
                Phone = "123456789"
            }
        };

        Console.WriteLine("Adding user to Database...");
        userToAdd = context.DomainEntities.Add(userToAdd);
        context.SaveChanges();

    }

我收到以下错误：违反多重性约束。关系“CamelotShiftManagement.DAL.DomainEnttyFK1”的角色“用户”具有多重性 1 或 0..1.![在此处输入图像描述]

Answer 1

问题不在于域实体引用的用户实体。问题是创建者和更新者的自我引用。它们都不是 Nullable ...所以我必须在属性中添加一个实际的 ID 号，并且需要在 Creator 和 Updater 的导航属性中放置一个实际的用户实体。