如何为用户django自动设置不可编辑的外键

from django.db import models

class User(models.Model):
    name = models.CharField(max_length=100)
    group = models.ForeignKey(Group, on_delete=models.CASCADE, editable=False)

from django import forms
from .models import User

class UserForm(forms.ModelForm):
    class Meta:
        model = User
        fields = '__all__'

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.fields['group'].widget.attrs['disabled'] = True

from django.shortcuts import render
from .forms import UserForm

def create_user(request):
    if request.method == 'POST':
        form = UserForm(request.POST)
        if form.is_valid():
            form.save()
            return render(request, 'success.html')
    else:
        form = UserForm()
    return render(request, 'create_user.html', {'form': form})