Store ValueObject in Database using ASP.NET Boilerplate

Question

Trying to implement DDD using ASP.NET Boilerplate and Entity Framework

Employee object

public class Employee : Entity<long>
{
   public virtual string Name { get; protected set; }

   public virtual Nationality Nationality { get; protected set; }
}

defines property Nationality, which is value object

public class Nationality : ValueObject<Nationality>
{      
    public virtual string Name { get; protected set; }
}

Attempt to add database migration produces obvious error

EntityType 'Nationality' has no key defined. Define the key for this EntityType.

Took a look at 3 different approach to persist value object in database

Should i implement one of the above mentioned method manually to persist ValueObject (if so what are some of the best practices) ? or it's already done by ASP.NET Boilerplate Framework ?

What is ValueObject<T>? I think the error has to do with the inheritance. Nationality as such should be interpreted as value object (ComplexType in EF terms). — Gert Arnold
– Gert Arnold, Commented Mar 19, 2017 at 15:25
I can use your code without problems in EF6, that is: with ValueObject<T> and Entity<T> from ABP. As a last resort, try modelBuilder.ComplexType<Nationality>();. — Gert Arnold
– Gert Arnold, Commented Mar 19, 2017 at 16:07
@GertArnold ComplexType is what i ended up doing, but it denormalized database structure, Nationality's columns into Employee's table. — tchelidze
– tchelidze, Commented Mar 19, 2017 at 16:36

prabakar · Accepted Answer · 2017-03-19 12:59:23Z

1

when you use Value object should not use virtual on the Nationality property on the Employee object. Remove the virtual keyword. that should fix it. Use Virtual only when you reference an entity type. Also you can get rid of virtual on the Nationality.Name property.

answered Mar 19, 2017 at 12:59

prabakar

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