check if Rails.root was initialized

Author: mojodojo101

lib/generators/tailwindcss/scaffold/scaffold_generator.rb

@@ -6,9 +6,15 @@ module Generators
     class ScaffoldGenerator < Erb::Generators::ScaffoldGenerator
       include Rails::Generators::ResourceHelpers
 
+
       def self.source_root
-        custom_scaffold_templates_path = Rails.root.join("lib", "templates", "erb", "scaffold")
-        return Dir.exist?(custom_scaffold_templates_path)? custom_scaffold_templates_path : File.expand_path("../templates", __FILE__)
+        fallback_path=File.expand_path("../templates", __FILE__)
+        if Rails.root.nil?
+          return fallback_path
+        else
+          custom_scaffold_templates_path = File.join(Rails.root,"lib", "templates", "erb", "scaffold")
+          return Dir.exist?(custom_scaffold_templates_path)? custom_scaffold_templates_path : fallback_path
+        end
       end
 
       argument :attributes, type: :array, default: [], banner: "field:type field:type"