From 9ce538484bd74573b83677770a94716b5a6bc152 Mon Sep 17 00:00:00 2001
From: anhefti <andreas.hefti@let.ethz.ch>
Date: Thu, 28 Oct 2021 13:45:34 +0200
Subject: [PATCH] fixed single moodle course bug

---
 .../lms/impl/moodle/MoodleCourseDataAsyncLoader.java      | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/moodle/MoodleCourseDataAsyncLoader.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/moodle/MoodleCourseDataAsyncLoader.java
index 4d3a9730..290afbc2 100644
--- a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/moodle/MoodleCourseDataAsyncLoader.java
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/lms/impl/moodle/MoodleCourseDataAsyncLoader.java
@@ -14,6 +14,7 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.function.Function;
@@ -215,9 +216,14 @@ public class MoodleCourseDataAsyncLoader {
 
             // then get all quizzes of courses and filter
             final LinkedMultiValueMap<String, String> attributes = new LinkedMultiValueMap<>();
+            final List<String> courseIds = new ArrayList<>(courseData.keySet());
+            if (courseIds.size() == 1) {
+                // NOTE: This is a workaround because the Moodle API do not support lists with only one element.
+                courseIds.add("0");
+            }
             attributes.put(
                     MoodleCourseAccess.MOODLE_COURSE_API_COURSE_IDS,
-                    new ArrayList<>(courseData.keySet()));
+                    courseIds);
 
             final String quizzesJSON = callMoodleRestAPI(
                     restTemplate,