Method scalar_one

lib/sqlalchemy/engine/result.py:1053–1068

Return exactly one scalar result or raise an exception. This is equivalent to calling :meth:`_engine.Result.scalars` and then :meth:`_engine.ScalarResult.one`. .. seealso:: :meth:`_engine.ScalarResult.one` :meth:`_engine.Result.scalars`

(self: Result[_T, Unpack[TupleAny]])

        )

    def scalar_one(self: Result[_T, Unpack[TupleAny]]) -> _T:
        """Return exactly one scalar result or raise an exception.

        This is equivalent to calling :meth:`_engine.Result.scalars` and
        then :meth:`_engine.ScalarResult.one`.

        .. seealso::

            :meth:`_engine.ScalarResult.one`

            :meth:`_engine.Result.scalars`

        """
        return self._only_one_row(
            raise_for_second_row=True, raise_for_none=True, scalar=True
        )

    def scalar_one_or_none(self: Result[_T, Unpack[TupleAny]]) -> Optional[_T]:
        """Return exactly one scalar result or ``None``.