Fix error when map is empty and try to add rating. #32

erikhofer · Jun 23, 2017 · d3c6a7c · d3c6a7c
1 parent 3e1a5f2
commit d3c6a7c
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/main/groovy/com/xinra/growthlectures/service/LectureServiceImpl.java b/src/main/groovy/com/xinra/growthlectures/service/LectureServiceImpl.java
@@ -307,6 +307,9 @@ public LectureSummaryDto convertToSummaryDto(Lecture lecture) {
   }
 
   public void supplyRatings(Collection<LectureSummaryDto> lectures, String userId) {
+    if (lectures.isEmpty()) {
+      return;
+    }
     // limitation of IN operator of PostgreSQL
     checkArgument(lectures.size() <= 30000, "Cannot supply more than 30,000 ratings at once!");
     Map<String, LectureSummaryDto> map = Maps.uniqueIndex(lectures, LectureSummaryDto::getId);