Django обновление записей

from django.db import models
 
class Vkontakte(models.Model):
    name = models.CharField(max_length=100)
    photo = models.TextField()
    domain = models.TextField()
 
    def __str__(self):              # __unicode__ on Python 2
        return self.name
    def __str__(self):              # __unicode__ on Python 2
        return self.photo
    def __str__(self):              # __unicode__ on Python 2
        return self.domain

from django.shortcuts import render_to_response, render, redirect
import vk
from social_django.models import UserSocialAuth
from thirdauth.models import Vkontakte
    
def home(request):
    user = request.user
    d = Vkontakte.objects.all()
    d.delete()
    try:
        social = user.social_auth.get(provider='vk-oauth2')
        access_token = social.extra_data.get('access_token')
        user_id = social.extra_data.get('id')
        session = vk.Session(access_token=access_token)
        api = vk.API(session)
        friends_get = api.friends.get(count='3', fields='nickname, photo_200_orig, domain', order='random')
        for i in friends_get:
            name = i.get('first_name')
            surname = i.get('last_name')
            n_and_s = name + ' ' + surname
            domain = i.get('domain')
            photo_200_orig = i.get('photo_200_orig')
            data = Vkontakte(name=n_and_s, photo=photo_200_orig, domain=domain)
            data.save()
    except:
        pass
    data = Vkontakte.objects.all()
    return render(request, 'thirdauth/home.html', {'user': user, 'data': data})