Как связать различные атрибуты пользовательской модели с другой моделью

Question

Я создаю Портал запросов для своего колледжа, и у него есть форма жалобы, имеющая различные поля, такие как Имя, Фамилия, адрес электронной почты и т. Д. Как я могу получить значения полей, таких как Имя, Фамилия, электронная почта, из уже сохраненных полей модели пользователя.

Пожаловаться на модель

from django.db import models
from datetime import date
from django.contrib.auth.models import User

class complain(models.Model):
    Username = models.ForeignKey(User,on_delete=models.CASCADE)
    First_name=models.CharField(max_length=30)
    Last_name=models.CharField(max_length=30)
    Roll_no=models.CharField(max_length=30)
    Email_address=models.EmailField(max_length = 100,verbose_name='email address',blank=False,)
    FIRST = '1st'
    SECOND = '2nd'
    THIRD = '3rd'
    FOURTH = '4th'
    Hostel=((FIRST, 'First'),(SECOND, 'Second'),(THIRD, 'Third'),    (FOURTH, 'Fourth'),)
   Hostel=models.CharField(max_length=3,choices=Hostel,default=FIRST,)
    Room_no=models.CharField(max_length=10)
    ACADEMIC = 'Academic'
    HOSTEL = 'Hostel'
    SPORTS= 'Sports'
    RAGGING = 'Ragging'
    ComplainDepartment=((ACADEMIC, 'Academic'),(HOSTEL, 'Hostel'),(SPORTS, 'Sports'),(RAGGING, 'Ragging'),)
                 ComplainDepartment=models.CharField(max_length=100,choices=ComplainDepartm ent,default=HOSTEL)
   Complain_Subject = models.CharField(max_length = 100,default =  "complain_subject")
   ACADEMIC_HEAD = 'Mr.J'
   HOSTEL_HEAD = 'Mr.Y'
   SPORTS_HEAD = 'Mr.Z'
   RAGGING_HEAD  = 'Mr.W'
   DepartmentHead=((ACADEMIC_HEAD, 'Mr.J'),(HOSTEL_HEAD, 'Mr.Y'),(SPORTS_HEAD, 'Mr.Z'),(RAGGING_HEAD, 'Mr.W'),)
DepartmentHead=models.CharField(max_length=10,choices=DepartmentHead,default=ACADEMIC_HEAD)
   ACADEMIC_HEAD_EMAIL = 'it1530@cemk.ac.in'
   HOSTEL_HEAD_EMAIL = 'it1531@cemk.ac.in'
   SPORTS_HEAD_EMAIL = 'it1525@cemk.ac.in'
   RAGGING_HEAD_EMAIL  = 'w.w5@gmail.com'
   E_O_H=((ACADEMIC_HEAD_EMAIL, 'it1530@cemk.ac.in'),(HOSTEL_HEAD_EMAIL, 'it1531@cemk.ac.in'),(SPORTS_HEAD_EMAIL, 'it1525@cemk.ac.in'),(RAGGING_HEAD_EMAIL, 'w.w5@gmail.com'),)
  E_O_H=models.CharField(max_length=100,choices=E_O_H,default=ACADEMIC_HEAD_EMAIL)
   ComplainDescription=models.TextField(max_length=500)
   ComplainDate=models.DateField(("Date"), default=date.today)
   NOTVISITED = 'NV'
   VISITED = 'V'
   INPROCESS= 'IP'
   COMPLETED = 'C'
   Status=((NOTVISITED, 'Not Visited'),(VISITED, 'Visited'),(INPROCESS, 'Inprocess'),(COMPLETED, 'Completed'),)
 Status=models.CharField(max_length=2,choices=Status,default=NOTVISITED)

  def __str__(self):
     return self.Name

Пожаловаться Форма

 from django.forms import ModelForm
 from shp.models import *

 class complainform(ModelForm):
    class Meta:
        model=complain
        fields=  ['Name','Roll_no','Email_address','Hostel','Room_no','ComplainDepartment','Complain_Subject','DepartmentHead','E_O_H','ComplainDescription','ComplainDate','Status']