Document that None skips in query strings. This fixes #224

14 years ago · 017117778e
1 changed files with 2 additions and 1 deletions
--- a/flask/helpers.py
+++ b/flask/helpers.py
@ -166,7 +166,8 @@ def url_for(endpoint, **values):
    ==================== ======================= =============================

    Variable arguments that are unknown to the target endpoint are appended
-    to the generated URL as query arguments.
+    to the generated URL as query arguments.  If the value of a query argument
+    is `None`, the whole pair is skipped.

    For more information, head over to the :ref:`Quickstart <url-building>`.