Method visit_unary

lib/sqlalchemy/orm/evaluator.py:342–358

(self, clause)

        )

    def visit_unary(self, clause):
        eval_inner = self.process(clause.element)
        if clause.operator is operators.inv:

            def evaluate(obj):
                value = eval_inner(obj)
                if value is _EXPIRED_OBJECT:
                    return _EXPIRED_OBJECT
                elif value is None:
                    return None
                return not value

            return evaluate
        raise UnevaluatableError(
            f"Cannot evaluate {type(clause).__name__} "
            f"with operator {clause.operator}"
        )

    def visit_bindparam(self, clause):
        if clause.callable: