Add full cover data to lesson serializer

api/v1/serializers/course.py

@@ -287,6 +287,9 @@ class LessonCreateSerializer(serializers.ModelSerializer):
         self.dispatch_content(lesson, content)
         return lesson
 
+    def to_representation(self, instance):
+        return LessonSerializer(instance, context=self.context).to_representation(instance)
+
 
 class LessonSerializer(LessonCreateSerializer):
     # course = CourseSerializer()