Generate Units::Defaults controller

bin/rails g controller Units/Defaults index

app/controllers/units/defaults_controller.rb

@@ -0,0 +1,8 @@
+class Units::DefaultsController < ApplicationController
+  before_action except: :index do
+    raise AccessForbidden unless current_user.at_least(:admin)
+  end
+
+  def index
+  end
+end

app/helpers/units/defaults_helper.rb

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+module Units::DefaultsHelper
+end

app/views/units/defaults/index.html.erb

@@ -0,0 +1,2 @@
+<h1>Units::Defaults#index</h1>
+<p>Find me in app/views/units/defaults/index.html.erb</p>