Pass checkout form to controller method

app/assets/javascripts/darkswarm/controllers/checkout/checkout_controller.js.coffee

@@ -18,7 +18,7 @@ Darkswarm.controller "CheckoutCtrl", ($scope, storage, Checkout, CurrentUser, Cu
 
   $scope.enabled = !!CurrentUser
 
-  $scope.purchase = (event)->
+  $scope.purchase = (event, form) ->
     event.preventDefault()
     $scope.submitted = true
-    $scope.Checkout.submit() if $scope.checkout.$valid
+    $scope.Checkout.submit() if form.$valid

app/views/checkout/_form.html.haml

@@ -2,7 +2,7 @@
   html: {name: "checkout",
     id: "checkout_form",
     novalidate: true,
-    "ng-submit" => "purchase($event)"} do |f|
+    "ng-submit" => "purchase($event, checkout)"} do |f|
 
   = inject_available_shipping_methods
   = inject_available_payment_methods

app/views/checkout/_summary.html.haml

@@ -1,5 +1,5 @@
 %orderdetails
-  = form_for current_order, url: "#", html: {"ng-submit" => "purchase($event)"} do |f|
+  = form_for current_order, url: "#", html: {"ng-submit" => "purchase($event, checkout)"} do |f|
     %fieldset
       %legend Your order
       %table
@@ -25,7 +25,7 @@
               %th= label
               %td= total
 
-      //= f.submit "Purchase", class: "button", "ng-disabled" => "checkout.$invalid", "ofn-focus" => "accordion['payment']"
+      //= f.submit "Purchase", class: "button", "ofn-focus" => "accordion['payment']"
       %a.button.secondary{href: cart_url} 
         %i.ofn-i_008-caret-left
         Back to Cart

spec/javascripts/unit/darkswarm/controllers/checkout/checkout_controller_spec.js.coffee

@@ -43,16 +43,12 @@ describe "CheckoutCtrl", ->
         scope.submitted = false
 
       it "delegates to the service when valid", ->
-        scope.checkout =
-          $valid: true
-        scope.purchase(event)
+        scope.purchase(event, {$valid: true})
         expect(Checkout.submit).toHaveBeenCalled()
         expect(scope.submitted).toBe(true)
 
       it "does nothing when invalid", ->
-        scope.checkout =
-          $valid: false
-        scope.purchase(event)
+        scope.purchase(event, {$valid: false})
         expect(Checkout.submit).not.toHaveBeenCalled()
         expect(scope.submitted).toBe(true)