id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 29740 Wrong lines shown on ValueError when rendering template with a bad for-loop Vasili Korol nobody "Consider the following setup: 1. There is a top level template (main.html): {{{ {% load staticfiles %} {% load compress %} {% load cms_tags sekizai_tags %} {% load solo_tags %} {% load lists %} {% load userextras %} {% get_solo 'maintenance.SiteConfiguration' as site_config %} ... Long template body .... {% block content %} {% endblock %} ... }}} 2. A child template ""taskclasses.html"" that extends ""main.html"": {{{ {% extends ajax|yesno:""ajax.html,main.html"" %} {% load staticfiles %} {% load compress %} {% load userextras %} ... {% block content %} ... {% for group, task_classes in task_classes_grouped %} .... {% endfor %} ... {% endblock %} }}} In my case, `task_classes_grouped` was a `dict`, so the ""for"" loop in ""taskclasses.html"" is invalid. This expectedly results in a `ValueError`, but the exception is reported wrongly: {{{ ValueError at /projects/1/taskclasses Need 2 values to unpack in for loop; got 1. Request Method: GET Request URL: http://devel:20062/projects/1/taskclasses Django Version: 1.11.15 Exception Type: ValueError Exception Value: Need 2 values to unpack in for loop; got 1. Exception Location: /usr/local/lib/python3.4/dist-packages/django/template/defaulttags.py in render, line 207 Python Executable: /usr/local/bin/uwsgi Python Version: 3.4.3 Python Path: ['/www/deploy/lib', '/data/programs/openbabel/lib/python3.4/site-packages/', '/www/deploy/apps/', '.', '', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/usr/local/lib/python3.4/dist-packages', '/usr/lib/python3/dist-packages', '/www/deploy'] Server time: Thu, 6 Sep 2018 11:52:03 +0000 ... Error during template rendering In template /www/deploy/viking/templates/main.html, error at line 0 Need 2 values to unpack in for loop; got 1. 1 2 3 {% load staticfiles %} 4 {% load compress %} 5 {% load cms_tags sekizai_tags %} 6 {% load solo_tags %} 7 {% load lists %} 8 {% load userextras %} 9 10 {% get_solo 'maintenance.SiteConfiguration' as site_config %} }}} This does not include the line that actually failed, and the template reference is wrong (parent template instead of the child). " Bug closed Template system 1.11 Normal duplicate template, valueerror, reporting Unreviewed 0 0 0 0 0 0