What's New in Edge Rails: RESTful Routing Updates 17

Posted by ryan
at 6:08 PM on Sunday, May 06, 2007

has_many and has_one RESTful Routing

Until the day comes that Rails’ routing can interrogate your domain model and properly translate the existing ActiveRecord associations into RESTful routes, we will have to settle for the same sugary-sweet declaration syntax. Instead of nesting resources in your routing configuration to imply an association, you can now directly specify the routing association with has_one and has_many:



map.resources :posts, :has_one => :author, :has_many => [:comments, :trackbacks]

This gets you what you’re used to seeing as:

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map.resources :posts do |posts|
  posts.resource :author
  posts.resources :comments
  posts.resources :trackbacks
end

You can always drop back to the nested form to specify more detailed options, but for vanilla routes this gets you an intuitive way to specify resource relationships that are directly reflected in your routing.

Auto Routing Name Prefixing

As part of the same update you no longer have to specify a named prefix for nested resources (to avoid conflicts with other named routes) – now named prefixes are assumed for you based on the resource nesting. For instance, this routing:

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map.resources :posts do |posts|
  posts.resources :comments
end

now provides a post_comments_url(post_id) helper method. Previously, you had to specify the post_ part of the name via the name_prefix option for your route:

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map.resources :posts do |posts|
  posts.resources :comments, :name_prefix => "post_"
end

Now that prefix is assumed for you (an assumption that could potentially break your routing and helper methods). If you don’t want the name_prefix assumed, you’ll need to explicitly set it to nil with :name_prefix => nil.

And don’t forget about the routing namespace update too

tags: ruby, rubyonrails

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  1. BJ Vicks – May 07, 2007 @ 02:56 PM

    Awesome. Both of these changes are simple and intuitive.

  2. jc – July 13, 2007 @ 05:13 AM

    How would I go more than 1 level deep?

    /groups/[GROUP_ID]/posts/[POST_ID]/comments/[COMMENT_ID]

  3. Emmanuel – September 17, 2007 @ 06:27 PM

    I would like to know the prent/child relationship of resources programatically, i.e, in:

    map.resources :posts do |posts| posts.resources :comments end

    Is there any way i could know that there is a PostsController and a CommentsController and that comments are children of posts? (ie inspecting some collection of ActionController::Base::Resource objects or something like that?) That would be fantastic for automating the scaffolding of controllers.

    Thanks!

  4. Tiago – March 02, 2010 @ 04:07 PM

    Is it possible to have has_many on a named route? for example:

    map.test ‘test/:test_name’, :controller => :tests do |test| test.other_route ’:other_name’, :controller => :others end

    ?

    I’m trying to figure this out here, but its not working.

  5. sales territory mapping – June 19, 2011 @ 06:01 PM

    Is there a way to take advantage of this without going on Edge rails? I like the idea of continuing RESTful controllers while breaking up the namespace. Even if the routes look a little funky until 2.0, I would be interested in giving it a shot.

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