From 9622deb9be195c639c3f16fe16cf9bcb28c1b880 Mon Sep 17 00:00:00 2001
From: Florian Wentzel <f.w.j.wentzel@gmail.com>
Date: Mon, 27 Apr 2026 21:36:03 +0200
Subject: [PATCH] Fix ZeroDivisonError on results page (#2709)

---
 evap/results/templates/distribution_widget.html       | 4 ++--
 evap/results/templates/results_evaluation_detail.html | 2 +-
 evap/results/templates/textanswer_list.html           | 2 +-
 evap/results/templatetags/results_templatetags.py     | 8 +++++---
 4 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/evap/results/templates/distribution_widget.html b/evap/results/templates/distribution_widget.html
index 5241e0b032..15ef5186f7 100644
--- a/evap/results/templates/distribution_widget.html
+++ b/evap/results/templates/distribution_widget.html
@@ -7,7 +7,7 @@
             title="{% include 'result_widget_tooltip.html' with question_result=question_result %}"
         >
             {% include 'distribution_with_grade.html' with question_result=question_result distribution=question_result.counts|normalized_distribution average=question_result.average %}
-            <div class="badge-participants badge-participants-{{ question_result.count_sum|participationclass:num_voters }} ms-2 ms-lg-3">
+            <div class="badge-participants badge-participants-{{ question_result.count_sum|badge_decile:num_voters }} ms-2 ms-lg-3">
                 <span class="fas fa-user"></span> {{ question_result.count_sum }}
             </div>
         </div>
@@ -23,4 +23,4 @@
             </div>
         </div>
     {% endif %}
-{% endspaceless %}
+{% endspaceless %}
\ No newline at end of file
diff --git a/evap/results/templates/results_evaluation_detail.html b/evap/results/templates/results_evaluation_detail.html
index 90ad3dfef1..08384011b0 100644
--- a/evap/results/templates/results_evaluation_detail.html
+++ b/evap/results/templates/results_evaluation_detail.html
@@ -225,7 +225,7 @@ <h3>{{ evaluation.full_name }} ({{ evaluation.course.semester.name }})</h3>
             <div class="card-header d-flex flex-row justify-content-between">
                 <span>{% translate 'Dropout' %}</span>
 
-                <div class="badge-participants badge-participants-{{ evaluation.dropout_count|participationclass:evaluation.num_voters }} ms-2 ms-lg-3">
+                <div class="badge-participants badge-participants-{{ evaluation.dropout_count|badge_decile:evaluation.num_voters }} ms-2 ms-lg-3">
                     <span class="fas fa-user"></span> {{ evaluation.dropout_count }}
                 </div>
             </div>
diff --git a/evap/results/templates/textanswer_list.html b/evap/results/templates/textanswer_list.html
index f2345fc3af..269d86fc05 100644
--- a/evap/results/templates/textanswer_list.html
+++ b/evap/results/templates/textanswer_list.html
@@ -6,7 +6,7 @@
             {% blocktranslate asvar intro_text %}These text answers can be seen by:{% endblocktranslate %}
             {% include 'textanswer_visibility_info.html' with intro_text=intro_text visible_by_contribution=question_result.answers_visible_to.visible_by_contribution visible_by_delegation_count=question_result.answers_visible_to.visible_by_delegation_count %}
         </span>
-        <div class="d-inline-block badge-participants badge-participants-{{ num_answers|participationclass:num_voters }} ms-2">
+        <div class="d-inline-block badge-participants badge-participants-{{ num_answers|badge_decile:num_voters }} ms-2">
             <span class="fas fa-user"></span> {{ num_answers }}
         </div>
     </div>
diff --git a/evap/results/templatetags/results_templatetags.py b/evap/results/templatetags/results_templatetags.py
index 38d9f41162..01e6d42db3 100644
--- a/evap/results/templatetags/results_templatetags.py
+++ b/evap/results/templatetags/results_templatetags.py
@@ -30,9 +30,11 @@ def evaluation_results_cache_timeout(evaluation):
     return 0  # don't cache at all
 
 
-@register.filter(name="participationclass")
-def participationclass(number_of_voters, number_of_participants):
-    return round((number_of_voters / number_of_participants) * 10)
+@register.filter(name="badge_decile")
+def badge_decile(dividend, divisor):
+    if divisor <= 0:
+        return 0
+    return round((dividend / divisor) * 10)
 
 
 @register.filter