Update Video file model

courses/videos/models.py

@@ -11,11 +11,12 @@ def get_upload_path(instance, filename):
 class VideoFile(models.Model):
     name = models.CharField(
         max_length=255,
+        null=True,
     )
     file = models.FileField(
         upload_to=get_upload_path,
         default=None,
-        null=True
+        null=True,
     )
     video = models.OneToOneField(
         'Video',

courses/videos/serializers.py

@@ -16,4 +16,4 @@ class VideoSerializer(serializers.ModelSerializer):
         model = Video
         fields = ('id', 'name', 'youtube_id', 'file')
 
-    file = VideoFileSerializer(required=False)
+    file = VideoFileSerializer(required=False, allow_null=True)