code: def get_object(self):
          
  
          query = self.filter_query(self.get_query())
  
          # If query joins more than one table and you need to base the lookup on something besides
          # an id field on the self.model, you can provide an alternative lookup as tuple of the model class
          # and a string of the column name.
          if isinstance(self.lookup_field, str):
              lookup_col = getattr(self.model, self.lookup_field)
              lookup_val = self.lookup_url_kwargs[self.lookup_field]
          else:
              assert isinstance(self.lookup_field, tuple), (
                  "'{}' `lookup_field` attribute should be a string or a tuple of (<model class>, `column`) "
                      .format(self.__class__.__name__)
              )
  
              lookup_col = getattr(self.lookup_field[0], self.lookup_field[1])
              lookup_val = self.lookup_url_kwargs[self.lookup_field[1]]
  
          try:
              instance = query.filter(lookup_col == lookup_val).one()
          except NoResultFound:
              raise HTTPNotFound()
  
          # May raise HTTPForbidden
          self.check_object_permissions(self.request, instance)
  
          return instance
docs: Returns the object the view is displaying.
          You may want to override this if you need to provide non-standard queryset lookups.
          Eg if objects are referenced using multiple keyword arguments in the url conf.
  
          :return: An instance of the view's model.