From https://once.com/writebook

app/controllers/pages/edits_controller.rb

@@ -0,0 +1,17 @@
+class Pages::EditsController < ApplicationController
+  include PageLeafScoped
+
+  before_action :set_edit
+
+  def show
+  end
+
+  private
+    def set_edit
+      if params[:id] == "latest"
+        @edit = @leaf.edits.last
+      else
+        @edit = @leaf.edits.find(params[:id])
+      end
+    end
+end