docs: def post(self, request, *args, **kwargs):
          """
          Handles POST requests, instantiating a form and formset instances with the passed
          POST variables and then checked for validity.
          """
          self.object = self.get_object()
          self.get_context_data()
          inlines = self.construct_inlines()
  
          if all_valid(inlines):
              return self.forms_valid(inlines)
          return self.forms_invalid(inlines)