@staticmethod

    def get_instance(user):

        ''' Returns the instance of attendee for the given user, or creates

        a new one. '''

        attendees = Attendee.objects.filter(user=user)

        if len(attendees) > 0:

            return attendees[0]

        else:

            attendee = Attendee(user=user)

            attendee.save()

            return attendee

    user = models.OneToOneField(User, on_delete=models.CASCADE)

    # Badge/profile is linked

    completed_registration = models.BooleanField(default=False)

    highest_complete_category = models.IntegerField(default=0)

class AttendeeProfileBase(models.Model):

    ''' Information for an attendee's badge and related preferences.

    Subclass this in your Django site to ask for attendee information in your

    registration progess.

     '''

    @classmethod

    def name_field(cls):

        ''' This is used to pre-fill the attendee's name from the

        speaker profile. If it's None, that functionality is disabled. '''

        return None

    attendee = models.OneToOneField(Attendee, on_delete=models.CASCADE)

# Inventory Models

@python_2_unicode_compatible

class Category(models.Model):

    ''' Registration product categories '''

    class Meta:

        verbose_name_plural = _("categories")

    def __str__(self):

        return self.name

    RENDER_TYPE_RADIO = 1

    RENDER_TYPE_QUANTITY = 2

        "sections": sections,

        "title": title,

        "total_steps": 3,

    }

    return render(request, "registrasion/guided_registration.html", data)

@login_required

def edit_profile(request):

    form, handled = handle_profile(request, "profile")

    data = {

        "form": form,

    }

    return render(request, "registrasion/profile_form.html", data)

def handle_profile(request, prefix):

    ''' Returns a profile form instance, and a boolean which is true if the

    form was handled. '''

    attendee = rego.Attendee.get_instance(request.user)

    try:

        profile = attendee.attendeeprofilebase

    except ObjectDoesNotExist:

        profile = None

    ProfileForm = get_form(settings.ATTENDEE_PROFILE_FORM)

    # Load a pre-entered name from the speaker's profile,

    # if they have one.

    try:

        speaker_profile = request.user.speaker_profile

        speaker_name = speaker_profile.name

    except ObjectDoesNotExist:

        speaker_name = None

    name_field = ProfileForm.Meta.model.name_field()

    initial = {}

        initial[name_field] = speaker_name

    form = ProfileForm(

        request.POST or None,

        initial=initial,

        instance=profile,

        prefix=prefix

    )

    handled = True if request.POST else False

    if request.POST and form.is_valid():

        form.instance.attendee = attendee

        form.save()

    return form, handled

@login_required

def product_category(request, category_id):

    ''' Registration selections form for a specific category of items.

    '''

    PRODUCTS_FORM_PREFIX = "products"