instance method generate_development_secret

# File railties/lib/rails/application.rb, line 608
      def generate_development_secret
        if secrets.secret_key_base.nil?
          key_file = Rails.root.join("tmp/development_secret.txt")

          if !File.exist?(key_file)
            random_key = SecureRandom.hex(64)
            FileUtils.mkdir_p(key_file.dirname)
            File.binwrite(key_file, random_key)
          end

          secrets.secret_key_base = File.binread(key_file)
        end

        secrets.secret_key_base
      end