def document(self, name: Optional[str] = None) -> DocumentReference:
collection = get_by_path(self._data, self._path)
if name is None:
name = generate_random_string()
new_path = self._path + [name]
if name not in collection:
set_by_path(self._data, new_path, {})
return DocumentReference(self._data, new_path, parent=self)
def document(self, path):
return DocumentReference(self._data, path, parent=None)