old_contents: from .models import Quote, Category, Product
  from django.views.generic.edit import CreateView, UpdateView
  
  
  class QuoteCreateView(CreateView):
      model = Quote
      fields = ['name']
      template_name = 'quote.html'
      success_url = '/'
  
      def get_form(self, form):
          form = super(QuoteCreateView, self).get_form()
          form.fields['category'].queryset = Category.objects.all()
          form.fields['products'].queryset = Product.objects.all()
          return form
  
      def form_valid(self, form):
          form.instance.user = self.request.user
          return super(QuoteCreateView, self).form_valid(form)
  
  
  class QuoteEditView(UpdateView):
      model = Quote
      fields = ['name']
      template_name = 'quote.html'
      success_url = '/'
  
      def get_form(self, form):
          form = super(QuoteEditView, self).get_form()
          form.fields['category'].queryset = Category.objects.all()
          form.fields['products'].queryset = Product.objects.all()
          return form
  
      def form_valid(self, form):
          form.instance.user = self.request.user
          return super(QuoteEditView, self).form_valid(form)
  
new_contents: from .models import Quote, Category, Product
  from django.views.generic.edit import CreateView, UpdateView
  
  
  class QuoteCreateView(CreateView):
      model = Quote
      fields = ['name']
      template_name = 'quote.html'
      success_url = '/'
  
      def get_form(self):
          form = super(QuoteCreateView, self).get_form()
          # form.fields['category'].queryset = Category.objects.all()
          # form.fields['products'].queryset = Product.objects.all()
          return form
  
      def form_valid(self, form):
          form.instance.user = self.request.user
          return super(QuoteCreateView, self).form_valid(form)
  
  
  class QuoteEditView(UpdateView):
      model = Quote
      fields = ['name']
      template_name = 'quote.html'
      success_url = '/'
  
      def get_form(self):
          form = super(QuoteEditView, self).get_form()
          form.fields['category'].queryset = Category.objects.all()
          form.fields['products'].queryset = Product.objects.all()
          return form
  
      def form_valid(self, form):
          form.instance.user = self.request.user
          return super(QuoteEditView, self).form_valid(form)
  
subject: Update view for basic quote form.