Include uncategorized pinned topics on 'Hot'

lib/topic_query.rb

@@ -27,6 +27,14 @@ class TopicQuery
        END DESC"
     end
 
+    def order_hotness
+      "CASE
+        WHEN (COALESCE(topics.pinned_at, '#{lowest_date}') > COALESCE(tu.cleared_pinned_at, '#{lowest_date}'))
+          THEN 100
+        ELSE hot_topics.score + (COALESCE(categories.hotness, 5.0) / 11.0)
+       END DESC"
+    end
+
     # If you've clearned the pin, use bumped_at, otherwise put it at the top
     def order_nocategory_with_pinned_sql
       "CASE
@@ -125,7 +133,7 @@ class TopicQuery
     return_list(unordered: true) do |list|
       # Find hot topics
       list = list.joins(:hot_topic)
-                 .order('hot_topics.score + (COALESCE(categories.hotness, 5.0) / 11.0) desc')
+                 .order(TopicQuery.order_hotness)
     end
   end