How to update django MultiModelForm? Please HELP

[Sunil Kothiyal]

Hello All,

 I had created multiModelForm in Django, I can view, and save data, I don't know how to Update data into the database. I want if user id exists in database then update else insert.exist in the database then update else insert.

This Code is working for me but I don't know how to update existing data?

# forms.py
from django import forms
from authtools.forms import UserCreationForm
from betterforms.multiform import MultiModelForm
from .models import UserProfile

class UserProfileForm(forms.ModelForm):
    class Meta:
        fields = ('favorite_color',)

class UserCreationMultiForm(MultiModelForm):
    form_classes = {
        'user': UserCreationForm,
        'profile': UserProfileForm,
    }

# views.py
from django.views.generic import CreateView
from django.core.urlresolvers import reverse_lazy
from django.shortcuts import redirect
from .forms import UserCreationMultiForm

class UserSignupView(CreateView):
    form_class = UserCreationMultiForm
    success_url = reverse_lazy('home')

    def form_valid(self, form):
        # Save the user first, because the profile needs a user before it
        # can be saved.
        user = form['user'].save()
        profile = form['profile'].save(commit=False)
        profile.user = user
        profile.save()
        return redirect(self.get_success_url())