Authentification d'utilisateur d'un autre modèle dans Django ? -Débordement de pile

I want to use GalaxyUser model to authenticate in Django:

class GalaxyUser(models.Model):
    id = models.IntegerField(primary_key=True)
    create_time = models.DateTimeField(null=True, blank=True)
    update_time = models.DateTimeField(null=True, blank=True)
    email = models.CharField(max_length=765)
    password = models.CharField(max_length=120)
    external = models.IntegerField(null=True, blank=True)
    deleted = models.IntegerField(null=True, blank=True)
    purged = models.IntegerField(null=True, blank=True)
    username = models.CharField(max_length=765, blank=True)
    form_values_id = models.IntegerField(null=True, blank=True)
    disk_usage = models.DecimalField(null=True, max_digits=16, decimal_places=0, blank=True)
    class Meta:
        db_table = u'galaxy_user'

I have included this line in settings.py:

AUTH_USER_MODEL = 'fileupload.GalaxyUser'

My login function is:

def login_backend(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user is not None:
            login(request, user)
            return HttpResponseRedirect('/overview/')
        else:
            return HttpResponseRedirect('/login_backend/')
    else:
        return render_to_response('login_backend.html', context_instance=RequestContext(request))

However the authentication is not working. Am I doing everything, right?

I want to use GalaxyUser model to authenticate in Django:

class GalaxyUser(models.Model):
    id = models.IntegerField(primary_key=True)
    create_time = models.DateTimeField(null=True, blank=True)
    update_time = models.DateTimeField(null=True, blank=True)
    email = models.CharField(max_length=765)
    password = models.CharField(max_length=120)
    external = models.IntegerField(null=True, blank=True)
    deleted = models.IntegerField(null=True, blank=True)
    purged = models.IntegerField(null=True, blank=True)
    username = models.CharField(max_length=765, blank=True)
    form_values_id = models.IntegerField(null=True, blank=True)
    disk_usage = models.DecimalField(null=True, max_digits=16, decimal_places=0, blank=True)
    class Meta:
        db_table = u'galaxy_user'

I have included this line in settings.py:

AUTH_USER_MODEL = 'fileupload.GalaxyUser'

My login function is:

def login_backend(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user is not None:
            login(request, user)
            return HttpResponseRedirect('/overview/')
        else:
            return HttpResponseRedirect('/login_backend/')
    else:
        return render_to_response('login_backend.html', context_instance=RequestContext(request))

However the authentication is not working. Am I doing everything, right?

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