code: def get_one(cls, db, *args, **kwargs):
          
          data = db[cls.collection].find_one(*args, **kwargs)
          if data:
              return cls.wrap_incoming(data, db)
          else:
              return None
docs: Returns an object that corresponds to given query or ``None``.
  
          Example::
  
              item = Item.get_one(db, {'title': u'Hello'})