code: def update(self, request, id):
          
          try:
              object = self.model.objects.get(id=id)
          except self.model.DoesNotExist:
              return self._render(
                  request = request,
                  template = '404',
                  context = {
                      'error': 'The %s could not be found.' % self.model.__name__.lower()
                  },
                  status = 404,
                  prefix_template_path = False
              )
  
          fields = []
          for field in request.PATCH:
  
              try:
                  self.model._meta.get_field_by_name(field)
              except FieldDoesNotExist:
                  continue
              else:
                  fields.append(field)
  
          Form = generate_form(
              model = self.model,
              form = self.form,
              fields = fields
          )
  
          form = Form(request.PATCH, instance=object)
          if form.is_valid():
              object = form.save()
  
              return self.show(request, id)
          else:
              return self._render(
                  request = request,
                  template = 'edit',
                  context = {
                      'form': form
                  },
                  status = 400
              )
docs: Update an object.