Render TOC for legislation draft versions

app/models/legislation/draft_version.rb

@@ -11,6 +11,12 @@ class Legislation::DraftVersion < ActiveRecord::Base
   validates :status, presence: true, inclusion: { in: VALID_STATUSES }
 
   def body_in_html
-    body_html || Redcarpet::Markdown.new(Redcarpet::Render::HTML.new).render(body)
+    renderer = Redcarpet::Render::HTML.new(with_toc_data: true)
+    toc_renderer = Redcarpet::Render::HTML_TOC.new(with_toc_data: true)
+
+    body_html = Redcarpet::Markdown.new(renderer).render(body)
+    toc = Redcarpet::Markdown.new(toc_renderer).render(body)
+
+    return toc, body_html
   end
 end