Entity Framework inheritance configuration goes wrong

Question

I have an abstract class Person.

public abstract class Person : Entity
{
    public string PassportFirstName { get; set; }
    public string PassportLastName { get; set; }
    public string InternationalFirstName { get; set; }
    public string InternationalLastName { get; set; }
    public PersonSocialIdentity SocialIdentity { get; set; }
    public PersonContactIdentity ContactIdentity { get; set; }

    public DateTime ? BirthDate { get; set; }

    protected Person()
    {

    }
}

And from Person there are derived concrete classes like Employee and Student

public class Employee : Person
{
    public Employee() : base()
    {
    }
}

And configuration classes chained by inheritance too:

public abstract class PrincipalEntityConfiguration<T>
    : EntityTypeConfiguration<T> where T : Entity
{
    protected PrincipalEntityConfiguration()
    {
        HasKey(p => p.Id);
        Property(p => p.Id).HasDatabaseGeneratedOption(DatabaseGeneratedOption.Identity);
    }
}

public abstract class PersonConfiguration<T> : PrincipalEntityConfiguration<Person> where T : Person
{
    protected PersonConfiguration()
    {
        HasRequired(p=>p.ContactIdentity).WithRequiredPrincipal();
        HasRequired(p=>p.SocialIdentity).WithRequiredPrincipal();
    }
}

public class EmployeeConfiguration : PersonConfiguration<Employee>
{
    public EmployeeConfiguration()
    {
        ToTable("Employees");
    }
}

And they are called in context :

protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new EmployeeConfiguration());
        modelBuilder.Configurations.Add(new StudentConfiguration());
        base.OnModelCreating(modelBuilder);
    }

and I got an exception:

A configuration for type 'EMIS.Entities.Domain.University.Person' has already been added. To reference the existing configuration use the Entity() or ComplexType() methods.

Clearly, it happens because in context there are doubly called Person Configuration. How can I fix this problem?

Masoud · Accepted Answer · 2016-11-12 06:47:51Z

1

Use EntityTypeConfiguration<Employee> instead PersonConfiguration<Employee>:

public class EmployeeConfiguration : EntityTypeConfiguration<Employee>
{
    public EmployeeConfiguration()
    {
       ToTable("Employees");
    }
}

answered Nov 12, 2016 at 6:47

Masoud

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2 Comments

Iskander Raimbaev Over a year ago

Here arise another problem : Additional information: Unable to determine the principal end of an association between the types 'EMIS.Entities.Domain.University.Person' and 'EMIS.Entities.Domain.University.PersonContactIdentity'. Does it mean that mapping works only for Person but not for derived classes?

Masoud Over a year ago

@IskanderRaimbayev: this one, is another problem: stackoverflow.com/questions/6531671/…

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