Merge pull request #417 from tarruda/master

Fixed assumption made on session implementations
13 years ago · 71a9766266
1 changed files with 3 additions and 1 deletions
--- a/flask/helpers.py
+++ b/flask/helpers.py
@ -283,7 +283,9 @@ def flash(message, category='message'):
                     messages and ``'warning'`` for warnings.  However any
                     kind of string can be used as category.
    """
-    session.setdefault('_flashes', []).append((category, message))
+    flashes = session.get('_flashes', [])
    flashes.append((category, message))
    session['_flashes'] = flashes
 def get_flashed_messages(with_categories=False, category_filter=[]):