2

routes:
 resources :drugs do
    collection do
      get :find_by_dci
    end
    #match '/drugs/find_by_dci/:id', :controller => 'drugs', :action =>'find_by_dci'
    resources :line_drugs
  end
controller:
  def find_by_dci
    drug = Drug.find(params[:id])
    @nume = Drug.where(:dci => drug.dci).select(:nume)
    respond_to do |format|
      format.html
      format.json
    end
  end
rake routes:
find_by_dci_drugs GET    /drugs/find_by_dci(.:format)                                                drugs#find_by_dci
link:
http://192.168.2.2:3000/drugs/find_by_dci/18 with the error:
No route matches [GET] "/drugs/find_by_dci/18"