LIL-303. Tree comments

api/v1/serializers/course.py

@@ -398,19 +398,23 @@ class CommentSerializer(serializers.ModelSerializer):
 
 class CourseCommentSerializer(serializers.ModelSerializer):
     author = UserSerializer()
+    children = CommentSerializer(many=True)
 
     class Meta:
         model = CourseComment
         fields = CommentSerializer.Meta.fields + (
             'course',
+            'children',
         )
 
 
 class LessonCommentSerializer(serializers.ModelSerializer):
     author = UserSerializer()
+    children = CommentSerializer(many=True)
 
     class Meta:
         model = LessonComment
         fields = CommentSerializer.Meta.fields + (
             'lesson',
+            'children',
         )