Create a custom user in Django1.8

admin.py

""" 
  file: profiles/admin.py
"""
from django.contrib import admin
from django.contrib.auth.forms import UserChangeForm, UserCreationForm, ReadOnlyPasswordHashField
from .models import User


# Formulario de creacion de usuario
class UserCreationForm(UserCreationForm):
    class Meta(UserCreationForm.Meta):
        model = User
        fields = ("email",)
        
# Formulario de edicion de usuario
class UserChangeForm(UserChangeForm):
    password = ReadOnlyPasswordHashField(label= ("Password"),
        help_text= ("Las contraseñas no se almacenan crudas. No hay manera de ver "
                    "la contraseña de este usuario, pero puedes cambiarla "
                    "usando <a href=\"password/\">este formulario</a>."))

    class Meta(UserChangeForm.Meta):
        model = User


class UserChangeForm(UserChangeForm):
    password = ReadOnlyPasswordHashField(label= ("Password"),
        help_text= ("Las contraseñas no se almacenan crudas. No hay manera de ver "
                    "la contraseña de este usuario, pero puedes cambiarla "
                    "usando <a href=\"password/\">este formulario</a>."))

    class Meta(UserChangeForm.Meta):
        model = User

# Admin del usuario
class UserAdmin(UserAdmin):
    form = UserChangeForm
    add_form = UserCreationForm

    fieldsets = (
        (None,           {'fields': ('username', 'first_name', 'last_name', 'email', 'phone', 'password',)}),
        ('Permisos',     {'fields': ('is_active', 'is_superuser', 'hotel', 'groups',)}),
    )

    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            'fields': ('username', 'first_name', 'last_name', 'email', 'password1', 'password2', 'phone',)}
        ),
    )

    list_display = ('username', 'fullname', 'email', 'phone', 'dni', 'is_active',)
    list_filter = ('is_active', 'is_superuser',)
    search_fields = ('username', 'first_name', 'last_name', 'email', 'dni', 'phone',)
    ordering = ('first_name', 'email',)

    def fullname(self, obj):
        return obj.get_full_name()

    fullname.short_description = 'Nombre completo'
    fullname.admin_order_field = 'first_name'


admin.site.register(User, UserAdmin)

models.py

""" 
  file: profiles/models.py
"""
from django.db import models
from django.contrib.auth.models import AbstractUser
from hotels.models import Hotel


class User(AbstractUser):
    """
    La clase extiende del modelo user de django y agrega
    los campos adicionales que se requieren
    """
    phone = models.CharField(max_length=255, blank=True, null=True)
    dni = models.CharField(max_length=255, blank=True, null=True, unique=True)

    def __unicode__(self):
        return self.get_full_name()

settings.py

...
AUTH_USER_MODEL = 'profiles.User'
...

user_manager.py

""" 
  file: profiles/user_manager.py
"""
from django.contrib.auth.models import BaseUserManager
from django.utils import timezone

class AuthUserManager(BaseUserManager):
    def create_user(self, email, password=None):
        if not email:
            raise ValueError('Users must have an email address')

        user = self.model(email=self.normalize_email(email),)
        user.is_active = True
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password):
        user = self.create_user(email=email, password=password)
        user.is_staff = True
        user.is_superuser = True
        user.save(using=self._db)
        return user