Django Custom User

forms.py

from django import forms
from django.contrib.auth.forms import UserCreationForm


class FormSignUp(UserCreationForm):
    email = forms.CharField(max_length=254, required=True, widget=forms.EmailInput())

    class Meta:
        model = User
        fields = [
            'first_name', 'last_name', 'birthdate', 'gender', 'site_facebook', 'site_twitter',
            'profile_picture', 'username', 'email', 'password1', 'password2'
        ]

models.py

import datetime
from dateutil.relativedelta import relativedelta

from django.db import models
from django.contrib.auth.models import AbstractUser

GENDERS = (
    ('m', 'Male'),
    ('f', 'Female'),
)


class User(AbstractUser):
    location = models.CharField(max_length=30, blank=True)
    birthdate = models.DateField(null=True, blank=True)
    gender = models.CharField(max_length=64, choices=GENDERS)
    site_facebook = models.URLField(blank=True)
    site_twitter = models.URLField(blank=True)
    profile_picture = models.ImageField(upload_to='profile_pictures', blank=True)

    @property
    def age(self):
        today = datetime.date.today()
        if self.birthdate:
            return u"%s" % relativedelta.relativedelta(today, self.birthdate).years
        else:
            return None

views.py

from django.core.urlresolvers import reverse_lazy
from django.views.generic import CreateView

from .forms import FormSignUp


class CreateUser(CreateView):
    form_class = FormSignUp
    template_name = 'signup.html'
    success_url = reverse_lazy('home')

    def form_valid(self, form):
        with transaction.atomic():
            form.instance.created_by = self.request.user
            form.instance.updated_by = self.request.user
            self.object = form.save()

        return super(CreateUser, self).form_valid(form)