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#6736 ✓invalid
Jack Chu

Problem with scoped routes and form_for helper

Reported by Jack Chu | April 22nd, 2011 @ 01:09 AM

I have a route that looks like this:

  namespace :admin do
    scope ':project_name' do
      resources :submissions

in the application controller I have a before_filter method that will get @project based on this project_name.

In my submissions#new form I have the following

  = form_for admin_submission_path(, @submission), :html => { :multipart => true } do |f|

What I get is a ActionController::RoutingError that spits this out:

No route matches {:action=>"show", :controller=>"admin/submissions", :project_name=>"someproject", :id=>#<Submission id: nil, state: "pending", photo: nil, created_at: nil, updated_at: nil, project_id: 1, description: nil>}

Here's a snippet of the framework trace:

actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:425:in `raise_routing_error'
actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:398:in `generate'
actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:454:in `generate'
actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:482:in `url_for'
actionpack (3.0.7) lib/action_dispatch/routing/url_for.rb:131:in `url_for'
actionpack (3.0.7) lib/action_view/helpers/url_helper.rb:99:in `url_for'
actionpack (3.0.7) lib/action_dispatch/routing/route_set.rb:195:in `admin_submission_path'
actionpack (3.0.7) lib/action_view/template.rb:135:in `block in render'

It looks like when I use a dynamic scope, the url_for helper can't generate the correct path.

Comments and changes to this ticket

  • Andrew White

    Andrew White April 22nd, 2011 @ 06:13 AM

    • State changed from “new” to “invalid”
    • Importance changed from “” to “Low”

    The error you're getting is because the @submission variable is a new record and the admin_submission_path url helper is expecting a value for :id. You're also using form_for in the wrong way - even if the url helper worked, the form_for helper would fail as you're not passing the correct arguments.

    Reading the form helper guide should help make things clearer.

  • Jack Chu

    Jack Chu April 22nd, 2011 @ 07:26 PM

    Andrew, thanks for your reply.

    I looked over the guide and that helped me with the proper arguments for form_for, however I can't find a good example of how to use form_for and scoped routes anywhere. I also wanted it to handle both create/update at the same time (so it can be used in a _form partial for example). Maybe you should add a section with dealing with scopes after the "Dealing with Namespaces" section.

    For anyone with the same issue, from looking at the form_for api and guide, this seems to the way to handle it:

    = form_for @submission, :url => @submission.new_record? ? submissions_path( : submission_path(, @submission), :html => { :multipart => true } do |f|

    Ternary operator in the url value checks to see if @submission is a new record and returns a create or edit path accordingly.

  • Jack Chu

    Jack Chu April 22nd, 2011 @ 07:42 PM

    Oops, I just noticed the API seems to prefer #persisted? to #new_record?, so I guess this works better:

    = form_for @submission, :url => @submission.persisted? ? submission_path(, @submission) : submissions_path(, :html => { :multipart => true } do |f|

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