Imagine I have two entities:
public class User{
public Guid UserId { get; set; }
}
public class Country{
public Guid CountryId {get; set;}
public virtual List<User> Users {get; set;}
}
If I try to add a user who doesn't belong to any country, I get an UpdateException
on the SaveChanges
command:
Entities in 'SLContext.User' participate in the 'Country_Users' relationship. 0 related 'Country_Users_Source' were found. 1 'Country_Users_Source' is expected
I believe this issue is related to the autogenerated one-to-many relationship. How can I set this multiplicity to 0.1 ---> * ?
If you are using FluentAPI, configuration for User
Entity should be :
HasOptional(x=> x.Country)
.WithMany(x=> x.Users);
And your User Entity :
public class User{
public Guid UserId { get; set; }
public virtual Country Country { get; set; }
}
Hope this help.