previous topic

models/database.py

@@ -97,6 +97,13 @@ class Topic(db.Model):
         if i >= len(topics):
             i = -1
         return topics[i].id
+    
+    def get_previous_index(self):
+        topics = self.event.sorted_topics()
+        i = topics.index(self) - 1
+        if i >= len(topics):
+            i = 0
+        return topics[i].id
 
 class Speaker(db.Model):
     __tablename__ = "speakers"

templates/admin_topic_show.html

@@ -57,6 +57,7 @@
                 {% endif %}
                 <li><a href="{{ url_for(".statement_undo") }}" class="rede-href"><i class="material-icons" role="presentation">undo</i> Previous</a></li>
                 <li><a href="{{ url_for(".topic_show", id=topic.get_next_index()) }}"><i class="material-icons">arrow_forward</i> Next Topic</a></li>
+                <li><a href="{{ url_for(".topic_show", id=topic.get_previous_index()) }}"><i class="material-icons">arrow_backward</i> Previous Topic</a></li>
             </ul>
         </div>
     </div>