Remove typo on signal

courses/signals.py

@@ -18,7 +18,7 @@ def lesson_created_or_updated(sender, instance: Lesson, **kwargs):
         previous_task_hask = ''
         ct = ContentType.objects.get_for_model(instance)
 
-        st = ScheduledTask.objects.filter(Content_type=ct, object_id=instance.id)
+        st = ScheduledTask.objects.filter(content_type=ct, object_id=instance.id)
         if st.exists():
             previous_task_hask = st.task_hash
         else:
@@ -29,7 +29,7 @@ def lesson_created_or_updated(sender, instance: Lesson, **kwargs):
             res.revoke()
 
         new_task_hash = publish_lesson.apply_async(args=[instance.id], eta=instance.release_date)
-        st.task_hash = task_hash
+        st.task_hash = new_task_hash
         st.content_object = instance
         st.release_date = instance.release_date
         st.save()