#434

backend/app/controllers/post_versions_controller.rb

@@ -38,13 +38,7 @@ class PostVersionsController < ApplicationController
   private
 
   def version_scope
-    PostVersion.joins(<<~SQL.squish)
-          LEFT JOIN
-            post_versions prev
-            ON
-              prev.post_id = post_versions.post_id
-              AND prev.version_no = post_versions.version_no - 1
-        SQL
+    PostVersion.with_previous_version
         .select('post_versions.*',
                 'prev.title AS prev_title',
                 'prev.url AS prev_url',