[已更新]使用 FK 的表中的 Can 种子数据

Question

There two tables

User and Preference. User has FK Preference. Trying to add data to both tables using migration.

        modelBuilder.Entity<User>().OwnsOne(p => p.Preference).HasData(
            new Preference
            {
                Id = Guid.Parse("A6293AB4-3A1B-4780-F207-0BC92650778B"),
                //other properties
            }
        );

        modelBuilder.Entity<User>().HasData(new User
        {
            Id = Guid.Parse("f90gh1b1-c121-4962-sa96-5c6fdb2af1ab"),
            //some other properties...
            
        });

Error I am getting when running add migration command.

The seed entity for entity type 'Preference' cannot be added because no value was provided for the required property 'UserId'.

There is no PreferenceId in User. Only Preference object. In cs files, User.cs has

    public virtual Preference Preference { get; set; } = null!;

UPDATE I added public Guid PreferenceId{get;set;} to User.cs, changed the code like this :

modelBuilder.Entity<User>().HasData(new User
        {
            Id = Guid.Parse("f90gh1b1-c121-4962-sa96-5c6fdb2af1ab"),
            //some other properties...
            PreferenceId = Guid.Parse(someGuid)
        });

REMOVED OwnsOne part. Updated DB and the record was added. How do I know if this was added as FK or not?

Answer 1

By adding the public virtual Preference Preference { get; set; } = null!; public virtual Preference Preference { get; set; } = null!; into your user class it creates the FK to preferences.

One way to do it would be to create a new user object and set the preferences variable to an object. eg

modelBuilder.Entity<User>().HasData(new User
    {
        Id = Guid.Parse("f90gh1b1-c121-4962-sa96-5c6fdb2af1ab"),
        Preference = new Preference
        {
            Id = Guid.Parse("A6293AB4-3A1B-4780-F207-0BC92650778B"),
            //other properties
        }

        //some other properties...
        
    });

Hope I am understanding the question correctly