docs: def exists(self, record_key):
          
          ''' 
              a method to determine if a record exists in collection
  
          :param record_key: string with key of record
          :return: boolean indicating file existence
          '''
          
          title = '%s.exists' % self.__class__.__name__
      
      # validate inputs
          input_fields = {
              'record_key': record_key
          }
          for key, value in input_fields.items():
              object_title = '%s(%s=%s)' % (title, key, str(value))
              self.fields.validate(value, '.%s' % key, object_title)
      
      # construct request kwargs
          list_kwargs = {
              'spaces': self.drive_space,
              'fields': 'files(id)'
          }
      
      # retrieve file id
          file_id, parent_id = self._get_id(record_key)
          if file_id:
              return True
          return False