string literals; why not.

app/controllers/accounts_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AccountsController < ApplicationController
   before_action :set_account, only: [:show, :edit, :reveal, :update, :destroy]
 

app/controllers/application_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationController < ActionController::Base
   protect_from_forgery with: :exception
 

app/controllers/auth_controller.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AuthController < ApplicationController
   skip_before_action :verify_session
 

app/helpers/application_helper.rb

@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 module ApplicationHelper
 end

app/models/account.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Account < ApplicationRecord
   serialize :password, CryptSerializer
 end

app/models/application_record.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
 

app/services/app_config.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class AppConfig < Settingslogic
   source "#{Rails.root}/config/application.yml"
   namespace Rails.env

app/services/crypt_serializer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require 'openssl'
 require 'base64'
 

app/views/accounts/_account.json.jbuilder

@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 json.extract! account, :id, :username, :password, :home, :site, :created_at, :updated_at
 json.url account_url(account, format: :json)

app/views/accounts/index.json.jbuilder

@@ -1 +1,2 @@
+# frozen_string_literal: true
 json.array! @accounts, partial: 'accounts/account', as: :account

app/views/accounts/show.json.jbuilder

@@ -1 +1,2 @@
+# frozen_string_literal: true
 json.partial! "accounts/account", account: @account