Method _get_strategy

lib/sqlalchemy/orm/interfaces.py:1148–1160

(self, key: _StrategyKey)

        return load

    def _get_strategy(self, key: _StrategyKey) -> LoaderStrategy:
        try:
            return self._strategies[key]
        except KeyError:
            pass

        # run outside to prevent transfer of exception context
        cls = self._strategy_lookup(self, *key)
        # this previously was setting self._strategies[cls], that's
        # a bad idea; should use strategy key at all times because every
        # strategy has multiple keys at this point
        self._strategies[key] = strategy = cls(self, key)
        return strategy

    def setup(
        self,