How to retrieve data from extended user model - django

Question

I am trying to make a simple signup/login page through django.
I have used UserCreationForm and used a model UserProfile to extend the user model.
I want to retrieve the data posted from form i.e department at my home page after user logged in.
I am new to django so brief explanation would be appreciated.
Thanks in advance
forms.py
from django import forms
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from mysite.core.models import UserProfile
from django.db import models
class SignUpForm(UserCreationForm):
first_name = forms.CharField(max_length=30, required=False, help_text='Optional.')
department = forms.CharField(max_length=30)
last_name = forms.CharField(max_length=30, required=False, help_text='Optional.')
email = forms.EmailField(max_length=254, help_text='Required. Inform a valid email address.')
class Meta:
model = User
fields = ('username', 'first_name', 'last_name', 'email','password1', 'password2', 'department',)
def save(self, commit=True):
# Save the provided password in hashed format
user = super(SignUpForm, self).save(commit=False)
user_profile = UserProfile(user=user, department=self.cleaned_data['department'])
user.save()
user_profile.save()
return user, user_profile
views.py
from django.contrib.auth.decorators import login_required
from django.contrib.auth import login, authenticate
from django.shortcuts import render, redirect
from mysite.core.forms import SignUpForm
#login_required
def home(request):
return render(request, 'home.html')
def signup(request):
if request.method == 'POST':
form = SignUpForm(request.POST)
if form.is_valid():
user,user_profile = form.save(commit=False)
username = user.cleaned_data.get('username')
raw_password = user.cleaned_data.get('password1')
user = authenticate(username=username, password=raw_password)
login(request, user)
return redirect('home')
else:
form = SignUpForm()
return render(request, 'signup.html', {'form': form})
models.py
from django.db import models
from django.contrib.auth.models import User
class UserProfile(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE,unique=True)
department = models.CharField(max_length=500, blank=True)
home.html in templates:
{% extends 'base.html' %}
{% block content %}
<h2>Welcome, <small>{{ user.username }}</small>!</h2>
<p>Your email address: {{ user.email }}</p>
<p>Department: {{ user_profile.department }}</p>
{% endblock %}
I am able to print username and email but department is coming empty.

Answer 1

Firstly, you have the wrong relationship. There is a one-to-one relationship between User and UserProfile; a user can only have one profile, and a profile can only belong to one user. The way you have it now, a user can have many profiles, which doesn't make sense.
You should replace the ForeignKey with a OneToOneField.
Once you have done that, you will be able to access the profile data via the relationship: user.userprofile.department, and so on.