Rails - Apr 2011 - scope form_for error

I have a route that looks like this:

scope '':project_name'' do
  resources :submissions
end

and a form_for tag that looks like this:

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

but for some reason it tries to match the show route instead and
returns a no route error. There seems to be some solutions on
stackoverflow but they look pretty messy to me:

http://stackoverflow.com/questions/3741979/form-for-and-scopes-rails-3

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BTW, there is an admin namespace in the route:

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

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