How to make an OwnsOne property in EF Core 3.0 required when mapping to SQL Server columns?

[KenBrannigan]

I have a main entity Profile that has a property Name that is a value object. The Name object has two properties First and Last. When I use the Fluent API to map the Name objects properties to columns within the Profile table I specify that they are required. When I create the migration it says nullable is true. I assume it has to do with the fact that in EF Core 3.0 owned entities are now optional but how do I tell EF that they are actually required?

public class Profile
{
   public Name Name { get; private set; }
   ...
}

public class Name
{
   public string First { get; }
   public string Last { get; }
   ...
}

public override void Configure(EntityTypeBuilder<Profile> builder)
{
   base.Configure(builder);

   builder.OwnsOne(
                navigationExpression: p => p.Name,
                buildAction: n =>
                {
                    n.Property(n => n.First)
                        .HasColumnName("NameFirst")
                        .HasMaxLength(25)
                        .IsRequired();

                    n.Property(n => n.Last)
                        .HasColumnName("NameLast")
                        .HasMaxLength(25)
                        .IsRequired();
                });
}

EF Core version: 3.0
Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: .NET Core 3.0
Operating system: Windows 10 1903 latest updates
IDE: Visual Studio 2019 16.3.5

I also posted this on stackoverflow:

https://stackoverflow.com/questions/58417334/how-to-make-an-ownsone-property-in-ef-core-3-0-required-when-mapping-to-sql-serv

Any help you can provide would be great.

Take care,
Ken

[davidhenley]

As of right now it's not possible without manually changing the migration.

[AndriySvyryd]

Required owned types are tracked by #12100
However value objects would work better if implemented using value converters: #13947

[m4ss1m0g]

However value objects would work better if implemented using value converters: #13947

Can you provide an example with value converters as value object ?

[AndriySvyryd]

Can you provide an example with value converters as value object ?

@m4ss1m0g Of course, as soon as it's implemented.