rubyonrailsin

I have in routes.rb

map.resources :labs, :collection => { :group => :get }

which is working. But when I try to pass a parameter, e.g.

<% form_tag group_labs_path( :patient_id => @patient.id ), :method
=> :get do %>

The :patient_id isn't getting passed to the controller:

--- !map:HashWithIndifferentAccess
group: !map:HashWithIndifferentAccess
id: "5"
commit: Add Lab
action: group
controller: labs

Doing it the non-restful way works:

<% form_tag :action => :group, :patient_id => @patient.id, :method
=> :get do %>

--- !map:HashWithIndifferentAccess
group: !map:HashWithIndifferentAccess
id: "6"
commit: Add Lab
method: get
authenticity_token: ...
action: group
patient_id: "8"
controller: labs

Any idea how to configure the route to pass the parameter?

Many TIA,
Craig

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