Scope form_for error

Rails
1

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:

2

BTW, there is an admin namespace in the route:

namespace :admin do
scope ‘:project_name’ do
resources :submissions
end
end