代码首先是外键冲突

Question

These are my two simplified entities

public class Team
{
    public int TeamId { get; set; }

    public string Name { get; set; }

    public User User { get; set; }

    public int UserId { get; set; }
}

Team entity configuration:

HasRequired(t => t.User)
           .WithOptional(u => u.Team);

The User class :

public class User
{
    public int UserId { get; set; }

    public string Username { get; set; }

    public Team Team { get; set; }

    public int TeamId { get; set; }
}

I made simple demo console application which inserts user to db then get it's primary key to make sure that foreign key is in databse.

static void Main(string[] args)
    {   
        var test = new InsertTest();
        var userId = test.InsertUser();
        test.InsertTeam(userId);
    }
public int InsertUser()
    {
        var user = new User();
        user.Username = "test1";
        user.Email = "aaa@mail.hr";
        user.Name = "test";
        user.LastName = "Test";
        user.Password = "123";
        user.ConfirmPassword = "123";
        UnitOfWork.UseRepository.Insert(user);
        UnitOfWork.Save();

        var userdB = UnitOfWork.UseRepository.Get().Where(u => u.Name == "test").FirstOrDefault();

        return userdB.UserId;
    }

 public void InsertTeam(int userId)
    {
        var team = new Team();

        team.Name = "Test";
        team.UserId = userId;

        UnitOfWork.TeamRepository.Insert(team);
        UnitOfWork.Save();
    }

But still I get foreign key conflict while inserting team in database. Really don't have any idea what to do next

The exception is: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Teams_dbo.Users_TeamId". The conflict occurred in database "Fantasy", table "dbo.Users", column 'UserId'. The statement has been terminated.

Answer 1

change your Team entity configuration to

HasOptional(c => c.User)
            .WithRequired(c => c.Team)
            .Map(m => m.MapKey("_field"));

You might also need to change

public User User { get; set; } and
public Team Team { get; set; }

to

public virtual User User { get; set; } and
public virtual Team Team { get; set; }