class Listing(models.Model):
    realtor = models.ForeignKey(Realtor, on_delete=models.CASCADE, verbose_name='Риелтор')
    category = models.ForeignKey(Category, on_delete=models.CASCADE, verbose_name='Категория')
    region = models.ForeignKey(Region, on_delete=models.CASCADE, verbose_name='Область')
    city = models.ForeignKey(City, on_delete=models.CASCADE, verbose_name='Город')
    district = models.ForeignKey(District, on_delete=models.CASCADE, verbose_name='Район')
    title = models.CharField(max_length=200, verbose_name='Заголовок')
    landmark = models.CharField(blank=True, max_length=200, verbose_name='Ориентир')
    ...
    def __str__(self):
        return self.title

class Category(models.Model):
    name = models.CharField(max_length=100, verbose_name='Название')
    slug = models.SlugField(blank=True)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('category_view', kwargs={'category_slug': self.slug})

    class Meta:
        verbose_name = 'Категория'
        verbose_name_plural = 'Категории'

def pre_save_category_slug(sender, instance, *args, **kwargs):
    if not instance.slug:
        slug = slugify(translit(str(instance.name), reversed=True))
        instance.slug = slug

pre_save.connect(pre_save_category_slug, sender=Category)

@login_required
def listing_add(request):
    logos = Logo.objects.all()
    feedbacks = Feedback.objects.all()
    categories = Category.objects.all()
    form = ListingForm()
    if request.method == "POST":
        form = ListingForm(request.POST, request.FILES)
        if form.is_valid():
            listing = form.save(commit=False)
            listing.realtor = request.user.realtor
            listing.save()
            return redirect('dashboard')
    return render(request, 'listings/listing_add.html', {
        'logos': logos,
        'form': form,
        'categories': categories,
        'feedbacks': feedbacks
    })

{% block content %}
<section id="listing_add" class="bg-light py-5">
    <div class="container">
      <div class="row">
        <div class="col-md-6 mx-auto">
          <div class="card">
            <div class="card-header bg-primary text-white">
              <h4>
                <i class="fas fa-plus"></i> Добавить объявление</h4>
            </div>
            <div class="card-body">
              <form method="POST" novalidate enctype="multipart/form-data">
                {% csrf_token %}
                {% bootstrap_form form %}
                <input type="submit" value="Добавить" class="btn btn-secondary btn-block">
              </form>
            </div>
          </div>
        </div>
      </div>
    </div>
  </section>
 {% endblock %}

<form id="searchForm" data-models-url="{% url 'ajax_load_models' %}" action="{% url 'search' %}" method="get">
    <div class="row">

        <div class="form-group col-4">
            {{ form.car_make }}
        </div>
        <div class="form-group col-4">
            {{ form.car_model }}
        </div>
    </div>

    <div class="form-group col-4">
        <input type="submit" value="Search" class="submit">
    </div>
</form>

$("#id_car_make").change(function () {
    var url = $("#searchForm").attr("data-models-url");  // get the url of the `load_cities` view
    var carMakeId = $(this).val();  // get the selected car make ID from the HTML input

    $.ajax({                       // initialize an AJAX request
        url: url,                    // set the url of the request (= localhost:8000/hr/ajax/load-cities/)
        data: {
            'car_make': carMakeId       // add the car make id to the GET parameters
        },
        success: function (data) {   // `data` is the return of the `load_models` view function
            $("#id_car_model").html(data);  // replace the contents of the model input with the data that came from the server
        }
    });

});

def load_models(request):
    car_make_id = request.GET.get('car_make')
    car_models = CarModel.objects.filter(car_make_id=car_make_id).order_by('name')
    return render(request, 'leases/partials/car_model_dropdown_list_options.html', {'car_models': car_models})

<option value="">Model</option>
    {% for car_model in car_models %}
    <option value="{{ car_model.pk }}">{{ car_model.name }}</option>
    {% endfor %}