Rails Engine 多语言路由如何写？

默认语言en, 路由前缀:

• en => /
• es => /es
• fr => /fr
• it => /it …

路由 routes

# config/routes.rb
Rails.application.routes.draw do
  # 正则最后是重点,用来配首页
  scope '(:locale)', locale: /es|fr|it|de|ja|zh|/ do
        mount Blorgh::Engine, at: '/'
  end
end

控制器 controller

module Blorgh
  class ApplicationController < ActionController::Base
    before_action :set_locale
    private
    def set_locale
      I18n.locale = if params[:locale].present?
        params[:locale]
      else
        I18n.default_locale
      end
    end
  end
end