Two columns on the same property - entity-framework

Question

I have a database table called Person having this columns {id, first_name, last_name}. Than I have a read model called PersonView having only two properties Id and Nominative. I have a mapping for this type:
public class PersonViewMapping : EntityTypeConfiguration<PersonView>
{
public PersonViewMapping()
{
this.ToTable("Person", "schema");
this.HasKey(d => d.id);
}
}
In this mapping I would say map the concatenation of Person.first_name and Person.last_name to PersonView.Nominative.
How can I do that?

Answer 1

you have to build your model as of the database, if you have to save the first and last name then you entity must have those two properties. so in your case as I understand ... you need to write your class as below
public class PersonView
{
public int Id { get; set; }
public string Firstname { get; set; }
public string Lastname { get; set; }
public string Nominative { get { return string.Concat(this.Firstname, " ", this.Lastname); } }
}
and in your configuration just Ignore that property
public class PersonViewMapping : EntityTypeConfiguration<PersonView>
{
public PersonViewMapping()
{
this.ToTable("Person");
this.HasKey(d => d.Id);
this.Property(d => d.Firstname);
this.Property(d => d.Lastname);
this.Ignore(d => d.Nominative);
}
}

Answer 2

I think you can do it this way, without mapping, as your nomination is not the actual field in your table and for this mapping not required.
public abstract class Person
{
public int ID { get; set; }
[Required]
[StringLength(50)]
[Display(Name = "Last Name")]
public string LastName { get; set; }
[Required]
[StringLength(50, ErrorMessage = "First name cannot be longer than 50 characters.")]
[Column("FirstName")]
[Display(Name = "First Name")]
public string FirstMidName { get; set; }
[Display(Name = "Full Name")]
public string FullName
{
get
{
return LastName + ", " + FirstMidName;
}
}
}