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Change user email address

I want the user to be able to change their email address. The user will change his email address, after which a confirmation email address will be sent to this address, after the user clicks the link, he will change his email address in the database.

I know that django-generic-confirm deals with similar confirmations, but I would like to try to do it myself.

To change the email address, my code will look like this:

User.objects.get(username=username).update(email=request.POST['email'])

And to send an email to this address, I would:

if 'Change Email' in request.POST.values():
    from django.core.mail import send_mail
    send_mail(
          'Confirm email change',
          'Click this **link** to confirm your change of email',
          'from@example.com',
          [request.POST['email']]
     )

How can I postpone an email change in db until the user confirms his email? And how do I create a link that activates email for this process? Thank.

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class EmailChangeAuth(models.Model):
    auth_key = models.CharField(max_length=42)
    user = models.ForeignKey(User)
    new_email = models.CharField(max_length=256)

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