new_contents: import os
  
  from pymongo import MongoClient
  from urllib.parse import urlparse
  
  mongo_url = os.environ.get('MONGODB_URL', 'mongodb://localhost:27017/') 
  # mongo_url_parse = urlparse(mongo_url)
  mongo_client = MongoClient(mongo_url)
  mongo_db = mongo_client['hotline']
  
  
  
subject: Define layer for Mongo client