How do I specify which column is the Foreign key and which column is the Primary Key on a one-to-many relationship. Using Entity Framework Core

Question

I Have two tables like so

   public class Shepherd 
    {
 public long Id { get; set; }
 public string Name { get; set; }
 public string UserId{ get; set; }
}

   public class Goat 
    {
 public long Id { get; set; }
 public string Hairyness { get; set; }
 public string CreatedBy { get; set; }
}

I know how to create the one-to-many relationship using the Ids but I need to create a one-to-many relationship from Shepherd to many Goats using the UserId and ' CreatedBy ' columns. I hope this makes sense. Thanks a lot in advance.

Answer 1

I found my own solution. Using Linq.

    var goatPoo = from Goats in _context.Goats
              join Shepherd in _context.Shepherds
              on Goats.CreatedBy equals Shepherd.UserId
              where Shepherd.UserId == 77
              select new { 
                  Shepherd.Id, 
                  Shepherd.Firstname, 
                  Shepherd.Lastname, 
                  Goats.Hairyness
              };