warn if handle_request returns dict

--HG--
branch : warn_dict_retval

lona/view_runtime.py

@@ -344,8 +344,19 @@ def start(self):
  self.send_view_start()
 
  # run view
+ handle_request_return_value = self.view.handle_request(self.request)
+ if isinstance(handle_request_return_value, dict):
+ co = self.view.handle_request.__func__.__code__
+ logger.warning(
+ 'Deprecated use of dict as return value of method handle_request {co_fn}, line {co_fln}',
+ extra={'co_fn': co.co_filename, 'cofln': co.co_firstlineno},
+ )
+ logger.warning(
+ ' (see: https://lona-web.org/1.x/api-reference/views.html#response-objects)',
+ )
+
  response = parse_view_return_value(
- return_value=self.view.handle_request(self.request),
+ return_value=handle_request_return_value,
  interactive=self.route and self.route.interactive,
  )