ruby-on-rails - config/routes.rb 中的机架助手

Question

假设我必须路由应该做同样的事情：重定向到特定的 URL，并在参数中进行一些替换。

get '/santitizer', to: redirect {|path_params, req| "/new_url/#{URI.encode(req[:my_param].gsub('.', ' '))}}"}
get '/old_santitizer', to: redirect {|path_params, req| "/new_url/#{URI.encode(req[:my_param].gsub('.', ' '))}}"}

我想应用 DRY 而不是两次使用相同的代码，而是使用一些辅助方法来做这样的事情

get '/santitizer', to: redirect {|path_params, req| santitize_helper(path_params, req)}
get '/old_santitizer', to: redirect {|path_params, req| santitize_helper(path_params, req)}

...

def santitize_helper(path_params, req)
  "/new_url/#{URI.encode(req[:my_param].gsub('.', ' '))}}"
end

可能吗？