First step of online html export

app/controllers/exports_controller.rb

@@ -0,0 +1,26 @@
+# frozen_string_literals: true
+
+class ExportsController < ApplicationController
+  layout "exports"
+
+  allow_unauthenticated_access only: [ :show ]
+
+  before_action :set_report
+
+  def show
+    @failed_success_criteria = @report.pages
+                                      .map(&:elements)
+                                      .flatten
+                                      .map(&:success_criteria)
+                                      .flatten
+                                      .select(&:failed?)
+    respond_to do |format|
+      format.html
+    end
+  end
+
+  private
+  def set_report
+    @report = Report.find(params[:report_id])
+  end
+end