Entity Framework 5 Code First - Non-Nullable Foriegn Key Fields - asp.net

Question

I am new to Entity Framework and about to embark on a new ASP.NET MVC project using EF5 Code First.
I noticed whilst trying out EF that the Foreign Key fields that are automatically generated for me in my database allow NULL's and I wonder how I configure things in code so as it doesn't allow nulls for these fields?
Example (edited for brevity):
public class Shop
{
int Id { get; set; }
string Name { get; set;
// Navigation Property.
Certificate Certificate { get; set; } // ******
}
public class Certificate
{
int Id { get; set; }
string Descrip { get; set; }
}
The Navigation Property that I have highlighted automatically generates a field in the Shop table in the DB, called Certificate_Id, but it allows NULL and I'd like to specify that it should not allow NULL's.
How can I do this using the Fluent API?

Answer 1

Try like this:
public class TempContext : DbContext
{
public DbSet<Shop> Shops { get; set; }
public DbSet<Certificate> Certificates { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Shop>().HasRequired(x => x.Certificate);
}
}

Answer 2

You could use the Required attribute to mark a property as required.
MSDN
Here is your example:
public class Shop
{
int Id { get; set; }
string Name { get; set;
[Required]
Certificate Certificate { get; set; }
}
Here is an explanation of the different annotations.

Answer 3

Try this:
public class Shop
{
int Id { get; set; }
string Name { get; set; }
[Required]
int CertId { get; set; }
// Navigation Property.
[ForeignKey("CertId")]
Certificate Certificate { get; set; } // ******
}
public class Certificate
{
int Id { get; set; }
string Descrip { get; set; }
}