商品聚合中加入促销信息 fix

@@ -32,7 +32,7 @@ public class PromotionIndexBuilder extends IIndexBuilder {
 
     @Override
     public String getId(Object object) {
-        return ((PromotionProductFlags) object).getId().toString();
+        return ((PromotionBO) object).getId().toString();
     }
 
     private List<PromotionBO> getPromotionBOs(int start, int limit) {