almost finished new design on product page / reproduced bug with amount not updating

front-ui/app/stores/cartStore.js

@@ -101,6 +101,19 @@ var takeItemOut = function(itemId) {
     saveCartStateForItem(itemId);
 };
 
+var setItemCount = function(itemId, count) {
+     var state = states[itemId] || new ItemInCart({
+        item_id: itemId,
+        count: 0
+    })
+    console.log("Old state", state.get('count'));
+    
+    state.set('count', state.get('count') + count);
+    console.log("New state", state.get('count'));
+    states[itemId] = state;
+    saveCartStateForItem(itemId);
+}
+
 var changeDeliveryDestinationProperty = function(property, value) {
     _deliveryDestination.set(property, value);
 
@@ -274,6 +287,9 @@ AppDispatcher.register(function(payload) {
         case CartConstants.CONFIRM_DELIVERY:
             saveDeliveryDestination();
             break;
+        case CartConstants.SET_ITEM_COUNT:
+            setItemCount(action.itemId, action.count);
+            break;
         default:
             return true;
     }