Determine if path exists as route in Rails controller

问题

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?

回答1:

For Rails 3 the call is

Rails.application.routes.recognize_path

Instead of

ActionController::Routing::Routes.recognize_path

Example:

def path_exists?(path)
  begin
    Rails.application.routes.recognize_path(path)
  rescue
    return false
  end

  true
end

回答2:

SOLUTION:

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

回答3:

You could possibly dynamically generate the route helper method and see if it exists (using respond_to? or even just catching any thrown exception).

回答4:

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.

回答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" }

来源：https://stackoverflow.com/questions/3273715/determine-if-path-exists-as-route-in-rails-controller

标签

ruby-on-rails

routing