ruby-on-rails - 使用 define_method 覆盖 Rails 中的路径助手

Question

我需要重写 Ruby on Rails 中的许多路径辅助方法并从中调用 super。我的标准方法是:
path_helper.rb

def business_path(business)
  if params[:city_id] == 2
    moscow_business_path(business)
  else
    super
  end
end

但是我有很多这样的方法，所以我想像这样动态地定义它们:

  %i[root businesses business ...].each do |path_method|
    method_name = "#{path_method}_path"
    old_method = method(method_name)
    define_method(method_name) do |*args|
      if params[:city_id] == 2
        public_send("moscow_#{method_name}")
      else
        old_method.call(*args)
      end
    end
  end

但是我得到这个错误:

 /home/leemour/Ruby/burobiz/app/helpers/path_helper.rb:31:in `method': undefined method `root_path' for class `Module' (NameError) 
 from /home/leemour/Ruby/burobiz/app/helpers/path_helper.rb:31:in `block in <module:PathHelper>'
 from /home/leemour/Ruby/burobiz/app/helpers/path_helper.rb:29:in `each' 
 from /home/leemour/Ruby/burobiz/app/helpers/path_helper.rb:29:in `<module:PathHelper>' 
 from /home/leemour/Ruby/burobiz/app/helpers/path_helper.rb:1:in `<top (required)>' 
 from /home/leemour/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:476:in `load'

我猜还没有包含辅助模块，所以没有原始路径辅助方法可以用 method(method_name) 捕获。然后我想我必须使用 self.included 钩子(Hook)，但我想不出来。我如何调整此代码以使其工作？ (我不想使用 eval)。

Answer 1

您是否尝试过使用 Rails.application.routes.url_helpers 方法，而不是尝试使用 Kernel.method？

%i[...].each do |path_method|
  define_method("#{path_method}_path") do |*args|
    if params[:city_id] == 2
      public_send("moscow_#{path_method}_path", *args)
    else
      Rails.application.routes.url_helpers.public_send("#{path_method}_path", *arsg)
    end
  end
end