#428

backend/app/controllers/post_versions_controller.rb

@@ -80,6 +80,7 @@ class PostVersionsController < ApplicationController
                           prev: row.attributes['prev_thumbnail_base'] },
         video_ms: { current: row.video_ms, prev: row.attributes['prev_video_ms'] },
         tags: build_version_tags(cur_tags, prev_tags),
+        parent_post_ids: row.parent_post_ids,
         original_created_from: {
             current: row.original_created_from&.iso8601,
             prev: row.attributes['prev_original_created_from']&.iso8601 },
@@ -121,10 +122,14 @@ class PostVersionsController < ApplicationController
             name = tag_names[snapshot['tag_id']] || snapshot.fetch('name')
             [tag_category_order(snapshot['category']),
              { identity: [:tag, snapshot['tag_id'], sections],
-               name: Post.tag_snapshot_literal(snapshot.merge('name' => name)) }]
+               name: Post.tag_snapshot_literal(snapshot.merge('name' => name)),
+               restore_name: tag_names[snapshot['tag_id']] &&
+                   Post.tag_snapshot_literal(snapshot.merge('name' => name)),
+               external: false }]
           elsif external_tag_names[snapshot['external_tag_id']]
             [6, { identity: [:external_tag, snapshot['external_tag_id']],
-                  name: external_tag_names[snapshot['external_tag_id']] }]
+                  name: external_tag_names[snapshot['external_tag_id']],
+                  restore_name: nil, external: true }]
           end
         }
         .sort_by { |order, tag| [order, tag[:name].downcase] }
@@ -136,8 +141,8 @@ class PostVersionsController < ApplicationController
   end
 
   def build_version_tags cur_tags, prev_tags
-    current = cur_tags.to_h { [_1[:identity], _1[:name]] }
-    previous = prev_tags.to_h { [_1[:identity], _1[:name]] }
+    current = cur_tags.index_by { _1[:identity] }
+    previous = prev_tags.index_by { _1[:identity] }
 
     (current.keys | previous.keys).map do |identity|
       type =
@@ -149,7 +154,9 @@ class PostVersionsController < ApplicationController
             'removed'
           end
 
-      { name: current[identity] || previous[identity], type: }
+      entry = current[identity] || previous[identity]
+      { name: entry[:name], restore_name: entry[:restore_name],
+        external: entry[:external], type: }
     end
   end
 end