In MTI or ForeignKey as primary key cases, it is required to fetch the attname from the field instance on the remote model in order to reliably resolve the to_field_name. Co-authored-by: Johannes Maron <info@johanneshoppe.com> Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com> Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>