How can I use custom objects with NHibernate

Question

Please see the domain object below:

public Class Person
{
    public virtual Guid Id { get; protected set; }
    public virtual string FirstName { get; protected set; }
    public virtual string Surname { get; protected set; }
    public virtual System.DateTime DateOfBirth { get; protected set; }

        //Domain methods are here.

}

and the NHibernate mappings below:

public class PersonMap : ClassMapping<Person>
{
    public PersonMap()
    {
        Id<Guid>(x => x.Id);
        Property<string>(x => x.FirstName);
        Property<string>(x => x.Surname);
        Property<DateTime>(x => x.DateOfBirth);
    }

}

This works as expected. Say I wanted to change the domain model to this:

public Class Person
{
    public virtual Guid Id { get; protected set; }
    public virtual FirstName FirstName { get; protected set; }
    public virtual Surname Surname { get; protected set; }
    public virtual DateOfBirth DateOfBirth { get; protected set; }
}

Notice the primitive types are replaced with objects. The reason I am doing this is to remove primitive obsession as described here: http://enterprisecraftsmanship.com/2015/03/07/functional-c-primitive-obsession/

I have read the documentation here (page 144): http://stc.sbu.ac.ir/AdminTools/Docs/Files/nhibernate_reference.pdf. It is telling me to introduce a custom type. I have also read this question: nHibernate mapping to custom types. I am still struggling to do this with NHibernate code mapping and hence the reason for the question.

David Osborne · Accepted Answer · 2017-10-16 11:29:02Z

1

Have you looked at mapping them via components?

This might be an easier starting point, compared with a custom type, if your data's in the same table.

answered Oct 16, 2017 at 11:29

David Osborne

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2 Comments

w0051977 Over a year ago

Before I mark your answer. Do you know if it is possible to map an NHibernate field to a class constructor instead of a class property (I have used a class property in my answer below)?

David Osborne Over a year ago

Not sure about that. If you look here (nhibernate.info/doc/nh/en/…) you can see the access strategies available. It doesn't look like the constructor is supported.

w0051977 · Accepted Answer · 2017-10-16 10:28:15Z

0

Following on from David Osbournes comment; the answer was to do this:

Component(x => x.FirstName, y =>
                {
                    y.Property<string>(z => z.FirstName);
                });

NHibernate using the FirstName property of a class to map to the database.

answered Oct 16, 2017 at 10:28

w0051977

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