Insert users id to the patient in Spring Boot - spring

Question

I can't insert the id of the currently logged-in user while making the patient data.
I want the user to be able to add his own patients, but the problem is that when I add a new patient, the column id_user is null
I tried lots of ways but couldn't add id_user to the patient.
What do I miss?
This is my User Entity:
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private int idUser;
private String firstName;
private String lastName;
private String username;
...
#ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.PERSIST)
#JoinTable(name = "users_roles",
joinColumns = #JoinColumn(name = "id_user"),
inverseJoinColumns = #JoinColumn(name = "id_role"))
#JsonManagedReference
private Set<Role> roles = new HashSet<>();
#OneToMany(cascade = CascadeType.ALL, mappedBy = "user")
private List<Patient> patients = new ArrayList<>();
public void add(Patient patient) {
if (patient != null) {
if (patients == null) {
patients = new ArrayList<>();
}
patients.add(patient);
patient.setUser(this);
}
}
Patient Entity:
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id_patient")
private int idPatient;
#Column(name = "first_name")
private String firstName;
#Column(name = "last_name")
private String lastName;
...
#ManyToOne
#JoinColumn(name = "user_id", nullable = false)
private User user;
}
Controller
#RequestMapping("/addPatient")
public String addPatient(Model theModel, HttpServletRequest request) {
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
UserDetails userD = (UserDetails) auth.getPrincipal();
User u = userService.findByUsername(userD.getUsername());
request.getSession().setAttribute("id_user", u.getIdUser());
// int userId = user.getIdUser();
int userId = (int) request.getSession().getAttribute("id_user");
User user = new User();
user.setIdUser(userId);
Patient patient = new Patient();
patient.setUser(user);
theModel.addAttribute("patient", patient);
return "user/patients/add-patient-dashboard";
}
#PostMapping("savePatient")
public String savePatient(#ModelAttribute("patient") Patient thePatient, Model model) {
patientService.save(thePatient);
return "redirect:/user/allPatients";
}
I try editing the User service from:
#Override
public void save(User user) {
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
userRepository.save(user);
}
to:
#Override
public void save(User user) {
List<Patient> patients = user.getPatients();
patients.forEach(patient -> user.add(patient));
user.setPassword(bCryptPasswordEncoder.encode(user.getPassword()));
userRepository.save(user);
}
if someone can help me resolve this I would appreciate it since I'm struggling for a very long time with this

Answer 1

Thanks to M Denium I finally solve the issue. I have moved the whole code from addUser to saveUser method:
#RequestMapping("/addPatient")
public String addPatient(Model theModel) {
Patient patient = new Patient();
theModel.addAttribute("patient", patient);
return "user/patients/add-patient-dashboard";
}
#PostMapping("savePatient")
public String savePatient(#ModelAttribute("patient") Patient thePatient, Model model, HttpServletRequest request) {
patientService.save(thePatient);
Authentication auth = SecurityContextHolder.getContext().getAuthentication();
UserDetails userD = (UserDetails) auth.getPrincipal();
User u = userService.findByUsername(userD.getUsername());
request.getSession().setAttribute("id_user", u.getIdUser());
int userId = (int) request.getSession().getAttribute("id_user");
User user = userService.findById(userId);
thePatient.setUser(user);
patientService.save(thePatient);
return "redirect:/user/allPatients";
}