Question

我想将应用程序的根目录设置为引擎控制器的操作。我以为我的config/routes.rb可以做到：

root action: :show, controller: :pages, module: :MyEngine

但是我遇到uninitialized constant PagesController错误。是否在自动加载引擎控制器之前设置了路线？

Answer 1

我相信引擎的控制器要等到安装后才能加载。我找不到找到想要的方式路由到引擎的方法，但是我确实找到了以下方法：

1）将引擎安装在根目录下（可能不是严格地想要的）

mount MyEngine => '/', as: :myengine

2）将root重定向到引擎

# For redirecting to the engine's mount
root to: redirect { Rails.application.routes.url_helpers.myengine_path }

# For a specific engine path
root to: redirect { MyEngine.routes.url_helpers.some_path }

如果您不介意对引擎路径进行硬编码，则可以：

root to: '/myengine/url'

在路线中可能存在更好的处理这些助手的方法，但这是我能找到的最直接的方法。我确实在this answer上偶然发现了一个稍微相关的问题，该问题提到专门为此类事情创建助手。对其进行修改以使其与引擎一起使用可能会给出以下信息：

class UrlRedirectHelper

  # This makes the case where you just want to use the main app's routes less verbose
  def self.method_missing(method, *args, **kwargs)
    new.public_send(method, *args, **kwargs)
  end

  # This is some entirely unnecessary sugar, I just like the way it reads
  def self.for(engine)
    new(engine)
  end

  def initialize(engine = Rails.application)
    @engine = engine
  end

  # This is called by `redirect` when it's preparing to redirect the user
  def call(_params, _request)
    url_helpers.public_send(@method, *@args, **@kwargs)
  end

  def method_missing(method, *args, **kwargs)
    super unless url_helpers.respond_to? method

    @method = method
    @args = args
    @kwargs = kwargs

    self
  end

  private

  # you could also `delegate` this, but it keeps the API cleaner to make it private
  def url_helpers
    @engine.routes.url_helpers
  end
end

然后像这样使用它：

get :somepath, to: redirect(UrlRedirectHelper.some_other_path)

# or, for an engine
get :somepath, to: redirect(UrlRedirectHelper.for(MyEngine).some_other_path)

Answer 2

我明确声明了我正在使用的控制器，而在config/routes.rb中没有名称间隔。

PagesController = MyEngine::PagesController

root action: :show, controller: :pages

做到了。我想知道我是否发现了module选项的错误吗？

将应用程序的根目录设置为引擎中的路由

2 个答案: