#354

backend/app/models/post.rb

@@ -137,6 +137,21 @@ class Post < ApplicationRecord
     end
   end
 
+  def snapshot_tags_json
+    post_tags
+        .kept
+        .joins(tag: :tag_name)
+        .includes(:sections, tag: :tag_name)
+        .order('tag_names.name')
+        .map do |pt|
+      { id: pt.tag.id,
+        version_no: pt.tag.version_no,
+        name: pt.tag.name,
+        category: pt.tag.category,
+        sections: pt.sections.map { { begin_ms: _1.begin_ms, end_ms: _1.end_ms } } }
+    end
+  end
+
   def self.section_literal section
     end_ms =
         section.end_ms ? Post.ms_to_time(section.end_ms) : ''