确定路径是否存在作为 Rails 控制器中的路由

Question

I want to know if an arbitrary path can be mapped to a route

recognized_request_for accomplishes what I want, but I can't get it to work in my controller.

Specifically, how can I execute recognized_request_for or something that accomplishes the same task from my controller?

Answer 1

For Rails 3 the call is

Rails.application.routes.recognize_path

Instead of

ActionController::Routing::Routes.recognize_path

Example:

def path_exists?(path)
  Rails.application.routes.recognize_path(path)
  true
rescue ActionController::RoutingError
  false
end

Answer 2

SOLUTION:

@related_page_path = '/' + @page.path
begin
  ActionController::Routing::Routes.recognize_path(@related_page_path, :method => :get)
rescue
  @related_page_path = nil
end

Answer 3

If you want to connect an arbitrary path the a controller and and action, you can use map.connect

map.connect '/any/random/string/of/stuff', :controller => 'items', :action => 'new'

You can even call out embedded param designations in the path:

map.connect '/seeking/room/for/[:number_of_nights]/nights', :controller => 'rooms', :action => 'index'

with the above you will receive the value represented in the url as part of the params hash in the controller.

Answer 4

您可能会动态生成路由助手方法并查看它是否存在（使用 respond_to? 甚至只是捕获任何抛出的异常）。

Answer 5

I recently came across an issue where I had to check if a path existed given an array of possible paths. I had tried the above suggestion Rails.application.routes.recognize_path , but it's depericated as of rails 4.2.1 . I used the following instead:

Rails.application.routes.named_routes.routes.any?{ |key, value| key.to_s === "new_article" }