Admin can't change distributor or order cycle once order has been finalized

app/overrides/spree/admin/orders/_form/add_distribution_fields.html.haml.deface

@@ -3,12 +3,22 @@
 %fieldset.no-border-bottom
   %legend{align => 'center'} Distribution
 
-  .alpha.six.columns
-    .field
-      = f.label :distributor_id
-      = f.collection_select :distributor_id, Enterprise.is_distributor.managed_by(spree_current_user), :id, :name, include_blank: true
+  - if @order.complete?
+    .alpha.six.columns
+      %p
+        %b Distributor:
+        = f.object.distributor.andand.name || "None"
+    .omega.six.columns
+      %p
+        %b Order cycle:
+        = f.object.order_cycle.andand.name || "None"
 
-  .omega.six.columns
-    .field
-      = f.label :order_cycle_id
-      = f.collection_select :order_cycle_id, OrderCycle.managed_by(spree_current_user), :id, :name, include_blank: true
+  - else
+    .alpha.six.columns
+      .field
+        = f.label :distributor_id
+        = f.collection_select :distributor_id, Enterprise.is_distributor.managed_by(spree_current_user), :id, :name, include_blank: true
+    .omega.six.columns
+      .field
+        = f.label :order_cycle_id
+        = f.collection_select :order_cycle_id, OrderCycle.managed_by(spree_current_user), :id, :name, include_blank: true

spec/features/admin/orders_spec.rb

@@ -43,7 +43,17 @@ feature %q{
     o.order_cycle.should == order_cycle
   end
 
-  it "can't change distributor and order cycle once order is created (or similar restriction)"
+  scenario "can't change distributor or order cycle once order has been finalized" do
+    login_to_admin_section
+    click_link 'Orders'
+    page.find('td.actions a.icon-edit').click
+
+    page.should have_no_select 'order_distributor_id'
+    page.should have_no_select 'order_order_cycle_id'
+
+    page.should have_selector 'p', text: "Distributor: #{@order.distributor.name}"
+    page.should have_selector 'p', text: 'Order cycle: None'
+  end
 
   scenario "capture multiple payments from the orders index page" do
     # d.cook: could also test for an order that has had payment voided, then a new check payment created but not yet captured. But it's not critical and I know it works anyway.