compatibility with django>2

f3279997 · Bruno Martin · 890228d6 · f3279997
Commit f3279997 authored Apr 28, 2019 by Bruno Martin
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courses_legacy/core/serializers.py courses_legacy/core/serializers.py +1 -1

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--- a/courses_legacy/core/serializers.py
+++ b/courses_legacy/core/serializers.py
@@ -448,7 +448,7 @@ class LessonSerializer(serializers.ModelSerializer):
                    activity.unit = unit
                    activity.save()
                    activities.append(activity)
-                unit.activities = activities
+                unit.activities.set(activities)
            units.append(unit)
        return units