old-zsterminator/app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  before_action :set_locale
  before_action :require_login

  private

  def set_locale
    I18n.locale = params[:locale] || session[:locale] || I18n.default_locale
    session[:locale] = I18n.locale
  end

  def default_url_options
    { locale: I18n.locale }
  end

  def current_user
    @current_user ||= User.find(session[:user_id]) if session[:user_id]
  end

  def logged_in?
    !!current_user
  end

  def require_login
    return if logged_in?

    flash[:alert] = t('sessions.login_required')
    redirect_to login_path
  end

  def set_company
    return unless logged_in?

    @company = current_user.company

    return if @company

    redirect_to companies_path, alert: 'No company found. Please create a company first.'
  end

  def current_company
    @company
  end
  helper_method :current_user, :logged_in?, :current_company
end