old_contents: from django.http import Http404, JsonResponse
  from django.views.generic import DetailView, ListView, TemplateView
  
  from .forms import ReviewForm
  from .models import Category, Product
  
  
  class AboutView(TemplateView):
      """This handles the 'About Us' page"""
  
      template_name = "store/about.html"
  
  
  class ContactView(TemplateView):
      """This handles the 'Contact Us' page"""
  
      template_name = "store/contact.html"
  
  
  class CategoryDetail(DetailView):
      model = Category
  
  
  class ProductList(ListView):
      model = Product
      template_name = 'store/index.html'
  
      def get_context_data(self, **kwargs):
          context = super(ProductList, self).get_context_data(**kwargs)
          context['latest'] = Product.objects.order_by('-added')[:3]
          return context
  
  
  class ProductCatalogue(ListView):
      model = Product
      template_name = 'store/catalogue.html'
  
      def get_context_data(self, **kwargs):
          context = super(ProductCatalogue, self).get_context_data(**kwargs)
          return context
  
  
  class ProductDetail(DetailView):
      model = Product
  
      def get_context_data(self, **kwargs):
          context = super(ProductDetail, self).get_context_data(**kwargs)
          context['images'] = self.object.images.all()
          context['main_image'] = self.object.images.first()
          context['specs'] = self.object.specs.all()
          context['reviews'] = self.object.reviews.all()
          context['form'] = ReviewForm(initial={'product': self.object})
          context['related'] = Product.objects.filter(
              category=self.object.category).exclude(
              id__exact=self.object.id)[:3]
          return context
  
  
  def product_review(request):
      if request.method == 'POST':
          # create a form instance and populate it with data from the request:
          form = ReviewForm(request.POST)
          if form.is_valid():
              # Save the form data
              form.save()
              return JsonResponse(
                  {"reviewRating": "", "reviewName": "", "reviewText": ""})
          else:
              response = {"reviewRating": "", "reviewName": "", "reviewText": ""}
              if 'rating' in form.errors:
                  response["reviewRating"] = form.errors['rating'][0]
              if 'name' in form.errors:
                  response["reviewName"] = form.errors['name'][0]
              if 'text' in form.errors:
                  response["reviewText"] = form.errors['text'][0]
              return JsonResponse(response)
      else:
          raise Http404
  
new_contents: from django.http import Http404, JsonResponse
  from django.views.generic import DetailView, ListView, TemplateView
  
  from .forms import ReviewForm
  from .models import Category, Product
  
  
  class AboutView(TemplateView):
      """This handles the 'About Us' page"""
  
      template_name = "store/about.html"
  
  
  class ContactView(TemplateView):
      """This handles the 'Contact Us' page"""
  
      template_name = "store/contact.html"
  
  
  class CategoryDetail(DetailView):
      model = Category
  
  
  class ProductList(ListView):
      model = Product
      template_name = 'store/index.html'
  
      def get_context_data(self, **kwargs):
          context = super(ProductList, self).get_context_data(**kwargs)
          context['latest'] = Product.objects.order_by('-added')[:3]
          return context
  
  
  class ProductCatalogue(ListView):
      model = Product
      template_name = 'store/catalogue.html'
  
  
  class ProductDetail(DetailView):
      model = Product
  
      def get_context_data(self, **kwargs):
          context = super(ProductDetail, self).get_context_data(**kwargs)
          context['images'] = self.object.images.all()
          context['main_image'] = self.object.images.first()
          context['specs'] = self.object.specs.all()
          context['reviews'] = self.object.reviews.all()
          context['form'] = ReviewForm(initial={'product': self.object})
          context['related'] = Product.objects.filter(
              category=self.object.category).exclude(
              id__exact=self.object.id)[:3]
          return context
  
  
  def product_review(request):
      if request.method == 'POST':
          # create a form instance and populate it with data from the request:
          form = ReviewForm(request.POST)
          if form.is_valid():
              # Save the form data
              form.save()
              return JsonResponse(
                  {"reviewRating": "", "reviewName": "", "reviewText": ""})
          else:
              response = {"reviewRating": "", "reviewName": "", "reviewText": ""}
              if 'rating' in form.errors:
                  response["reviewRating"] = form.errors['rating'][0]
              if 'name' in form.errors:
                  response["reviewName"] = form.errors['name'][0]
              if 'text' in form.errors:
                  response["reviewText"] = form.errors['text'][0]
              return JsonResponse(response)
      else:
          raise Http404
  
subject: Remove redundant method