code: def _get_document_path(client, path):
      
      parts = (client._database_string, "documents") + path
      return _helpers.DOCUMENT_PATH_DELIMITER.join(parts)
docs: Convert a path tuple into a full path string.
  
      Of the form:
  
          ``projects/{project_id}/databases/{database_id}/...
                documents/{document_path}``
  
      Args:
          client (~.firestore_v1beta1.client.Client): The client that holds
              configuration details and a GAPIC client object.
          path (Tuple[str, ...]): The components in a document path.
  
      Returns:
          str: The fully-qualified document path.