Display count of dirty variant overrides

app/assets/javascripts/admin/controllers/override_variants_controller.js.coffee

@@ -1,4 +1,4 @@
-angular.module("ofn.admin").controller "AdminOverrideVariantsCtrl", ($scope, Indexer, SpreeApiAuth, PagedFetcher, StatusMessage, hubs, producers, hubPermissions, VariantOverrides) ->
+angular.module("ofn.admin").controller "AdminOverrideVariantsCtrl", ($scope, Indexer, SpreeApiAuth, PagedFetcher, StatusMessage, hubs, producers, hubPermissions, VariantOverrides, DirtyVariantOverrides) ->
   $scope.hubs = hubs
   $scope.hub = null
   $scope.products = []
@@ -31,6 +31,11 @@ angular.module("ofn.admin").controller "AdminOverrideVariantsCtrl", ($scope, Ind
 
 
   $scope.displayDirty = ->
+    if DirtyVariantOverrides.count() > 0
+      num = if DirtyVariantOverrides.count() == 1 then "one override" else "#{DirtyVariantOverrides.count()} overrides"
+      StatusMessage.display 'notice', "Changes to #{num} remain unsaved."
+    else
+      StatusMessage.clear()
 
 
   $scope.update = ->

app/assets/javascripts/admin/services/dirty_variant_overrides.js.coffee

@@ -5,3 +5,9 @@ angular.module("ofn.admin").factory "DirtyVariantOverrides", ->
     add: (vo) ->
       @dirtyVariantOverrides[vo.hub_id] ||= {}
       @dirtyVariantOverrides[vo.hub_id][vo.variant_id] = vo
+
+    count: ->
+      count = 0
+      for hub_id, vos of @dirtyVariantOverrides
+        count += Object.keys(vos).length
+      count

spec/javascripts/unit/admin/services/dirty_variant_overrides_spec.js.coffee

@@ -38,3 +38,24 @@ describe "maintaining a list of dirty variant overrides", ->
           hub_id: 2
           price: 3
           count_on_hand: 4
+
+  it "counts dirty variant overrides", ->
+    DirtyVariantOverrides.dirtyVariantOverrides =
+      2:
+        1:
+          variant_id: 5
+          hub_id: 6
+          price: 7
+          count_on_hand: 8
+        3:
+          variant_id: 9
+          hub_id: 10
+          price: 11
+          count_on_hand: 12
+      4:
+        5:
+          variant_id: 13
+          hub_id: 14
+          price: 15
+          count_on_hand: 16
+    expect(DirtyVariantOverrides.count()).toEqual 3