Merging "add" form in Django Admin from 2 or more Models (connected with one-to-one relationship)

Question

I have a Django's default UserCreationForm to add a new user via Admin app. I want to add new fields from another custom model called UserProfile. The UserProfile has a One-to-One relationship with Django's User model. The additional fields which UserProfile model has are phone number, company name etc.

Is there a way where I can merge UserProfile form with Django's default User form while creation of the new user from Admin panel?

I looked at Django's documentation here on Inline forms but seems their require foreign key relationship.

Django 2.1

Answer 1

Assuming you have Profile with extra field phone_number. Like this

class Profile(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    phone_number = models.CharField(max_length=24)

You can follow following steps to add extra fields in UserCreationForm in Admin.

1. Create custom UserCreationForm

Inherit from UserCreationForm and Add extra fields and functionality.

from django import forms
from django.contrib.auth.forms import UserCreationForm
from account.models import Profile

class UserWithProfileCreationForm(UserCreationForm):
    phone_number = forms.CharField(max_length=32)

    def save(self, commit=True):
        instance = super().save(commit=True)
        profile = Profile(user=instance, phone_number=self.cleaned_data['phone_number'])
        profile.save()
        return instance

2. Unregister (already registered) User model and register again with custom form and fields

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.models import User

# unregister first
admin.site.unregister(User)


@admin.register(User)
class UserWithProfileAdmin(UserAdmin):
    add_form = UserWithProfileCreationForm
    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            # add any custom fields here
            'fields': ('username', 'password1', 'password2', 'phone_number'),
        }),
    )