diff --git a/courses/models.py b/courses/models.py
index bb4163c..1c3c41a 100755
--- a/courses/models.py
+++ b/courses/models.py
@@ -978,3 +978,4 @@ class Flow(models.Model):
 class NormalMap(models.Model):
     course = models.OneToOneField(to=Course)
     json_tree = models.TextField(default='')
+    independent_elements = models.TextField(default='')
diff --git a/courses/serializers.py b/courses/serializers.py
index c382bae..e8c19e7 100644
--- a/courses/serializers.py
+++ b/courses/serializers.py
@@ -11,7 +11,10 @@ class LessonSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = Lesson
-        fields = ('id', 'title', 'on_comment', 'free')
+        fields = (
+            'id', 'title', 'on_comment', 'materials',
+            'free', 'video', 'video_id',
+        )
 
     @staticmethod
     def get_on_comment(self):
@@ -36,7 +39,7 @@ class ThemeSerializer(serializers.ModelSerializer):
 
     class Meta:
         model = CourseTheme
-        exclude = ('price_type', '_type', 'sort')
+        exclude = ('price_type', '_type', 'sort', 'on_comment')
 
 
 class CourseListSerializer(serializers.ModelSerializer):
@@ -105,7 +108,6 @@ class CourseDetailSerializer(serializers.ModelSerializer):
             'preview', 'use_fail', 'basic_len',
             'addition_len', 'min_price', 'buy_icon',
             'must_build', 'keywords', 'recommend',
-            'on_comment'
         )
 
     @staticmethod