Entity Framework CF Fluent API mapping - entity-framework

Question

I have 2 entities:
public class User
{
public int userId { get; set; }
public string name { get; set; }
public Guid userGuid { get; set; }
}
public class Absence
{
public int absenceId { get; set; }
public Guid applicantId { get; set; }
public User applicant { get; set; }
public Guid permitterId{ get; set; }
public User permitter{ get; set; }
...
}
AbsencesConfiguration:
this.HasRequired(u => u.Applicant).WithMany().HasForeignKey(d => d.ApplicantId);
this.HasRequired(u => u.Permitter).WithMany().HasForeignKey(d => d.PermitterId);
I'd like a Fluent API mapping between the two classes, but it gives this error message:
Blockquote\tSystem.Data.Entity.Edm.EdmAssociationConstraint: : The types of all properties in the Dependent Role of a referential constraint must be the same as the corresponding property types in the Principal Role. The type of property 'ApplicantId' on entity 'Absences' does not match the type of property 'UserId' on entity 'User' in the referential constraint 'Absences_Applicant'.
I think this is because EF try to join the two tables with the UserId of the User entity and not with UserGuid column. I thought I would make these two columns of Absence entity unique, but how I can map them together?
Thanks in advance.

Answer 1

The problem is your User primary key is an int, but your foreign key is a Guid.
You need to alter either your User class to have a guid for userId:
public Guid userId { get; set; }
or, update your Absence class to use an int:
public int applicantId { get; set; }