message: Update delete function in flask
diff: @@ -17,7 +17,7 @@ def create():
  return {'id': str(created_item.inserted_id), 'text': list_item['text']}
  def delete(id):
  - query_str = {'id': ObjectId(id)}
  + query_str = {'_id': ObjectId(id)}
  result = list_items.delete_one(query_str)
  if result.deleted_count == 0:
  raise Exception('Could not find an item with given id')
  