POST запрос: как записать данные в таблицу из select? Spring boot + freemarker

@GetMapping("/profile")
    public String getProfile(Model model, @AuthenticationPrincipal User user, Personal personal) {
        model.addAttribute(user);
        model.addAttribute("personal", userService.findBio(user));
        model.addAttribute("specialities", userService.specialityList());
        return "user-profile";
    }
 
@PostMapping("/activate/{id}")
public String doctorUser(@PathVariable("id") Long id, Doctor doctor, Speciality speciality) {
    userService.createDoctor(id, doctor, speciality);
    return "redirect:/users";
}

public List<Speciality> specialityList(){
    return specialityRepository.findAll();
}
 
public void createDoctor(Long id, Doctor doctor, Speciality speciality) {
    User user = userRepository.findById(id).orElse(null);
    doctor.setUser(user);
    doctor.setSpeciality(specialityRepository.getById(speciality.getId()));
    doctorRepository.save(doctor);
    user.getRole().clear();
    user.getRole().add(Role.DOCTOR);
    userRepository.save(user);
}

Entity @Table(name ="speciality") public class Speciality {
 
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
private Long id;
 
@Column(name = "name", length = 200) 
private String name;
 
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "speciality")
private List<Doctor> doctors = new ArrayList<>();
}

@Entity
@Table(name ="doctors")
public class Doctor{
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;
    
    @OneToOne
    @JoinColumn(name = "user_id")
    private User user;
    
    @ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.LAZY)
    @JoinColumn(name = "speciality_id")
    private Speciality speciality;}