gistfile1.rb

# routes.rb
resources :fidelity_bonds do
  resources :edits
  member do
    get :edit_principal
  end
end

# app/views/fidelity_bonds/edit_principal.html.haml
= simple_form_for @fidelity_bond, :url => fidelity_bond_edits_path(@fidelity_bond) do |f|
  = f.input :principal_name
  = f.input :principal_address1
  = f.submit :Update


# edits_controller.rb
class EditsController < ApplicationController
  def create
    p params
  end
end

#  When I submit the form rendered by /fidelity_bonds/2/edit_principal I see this in my logs:

# Started POST "/fidelity_bonds/2/edits" for 127.0.0.1 at Fri Jul 15 11:02:11 -0500 2011
# ActionController::RoutingError (No route matches "/fidelity_bonds/2/edits"):