Entity Framework Code First : how to annotate a foreign key for a “Default” value?

Question

I have 2 classes: Client and Survey.

Each Client can have many surveys - but only one default survey.

I have defined the classes like this:

p         


        

Answer 1

Please notice that adding the code below you will fix the issue.

public class ApplicationDbContext : IdentityDbContext
{
    public ApplicationDbContext() : base("DefaultConnection")
    {

    }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
          modelBuilder.Entity()
                      .HasOptional(x => x.DefaultSurvey)
                      .WithMany(x => x.Surveys);
                      .HasForeignKey(p => p.DefaultSurveyID);
    {
}