I am working on a practice project to create 3 separate pages that is Brand Page, Car Model Page and Car Model Variant detail page.

I am working on a project with three models car brands, car model, car model variantsWhen an user opens the Car model page they should see the list of variants in that car model

class BrandName(models.Model):    FullName = models.CharField(max_length= 100)    Slogan = models.CharField(max_length = 255)    slug = models.SlugField(unique=True)    def __str__(self):        return f"{self.FullName}"class CarModel(models.Model):    Brand = models.ForeignKey(BrandName, on_delete = models.CASCADE,null=True, related_name = "brands")    ModelName = models.CharField(max_length = 200)    slug = models.SlugField(unique=True)    def __str__(self):        return f"{self.ModelName}"class CarModelVariant(models.Model):    ModelVariantName = models.CharField(max_length = 100)    Brandname = models.ForeignKey(BrandName, on_delete = models.CASCADE, null = True, related_name="brands1")    Model1 = models.ForeignKey(CarModel, on_delete = models.CASCADE, null = True, related_name = "model1")    Doors = models.IntegerField    SeatingCapacity = models.IntegerField    def __str__(self):        return f"{self.ModelVariantName}"

**In views.py of the app

**

from django.shortcuts import renderfrom django.http import HttpResponsefrom . models import CarModelVariant, CarModel, BrandNamefrom django.views.generic import ListView, DetailViewclass CarModelVariantView(ListView):    template_name = "carlist.html"    model = CarModelVariant    def get_queryset(self):        list_model = super().get_queryset()        data = list_model.filter(Model1= CarModel_instance)        return data

In urls.py of the app

`from django.urls import pathfrom . import views

urlpatterns = [path("slug:slug", views.CarModelVariantView.as_view())]`

I am facing a blank page while loading carlist.html template

`{% extends "base.html" %}{% block title%}Car Brand Variants List{% endblock%}{% block content %}<ul>    {% for variant in data %}<li>{{ variant }}</li>    {% endfor %}</ul>{% endblock %}`