Doctrine\ODM\MongoDB\Mapping\ClassMetadataInfo::applyStorageStrategy PHP Method

    private function applyStorageStrategy(array &$mapping)
    {
        if (!isset($mapping['type']) || isset($mapping['id'])) {
            return;
        }
        switch (true) {
            case $mapping['type'] == 'int':
            case $mapping['type'] == 'float':
            case $mapping['type'] == 'increment':
                $defaultStrategy = self::STORAGE_STRATEGY_SET;
                $allowedStrategies = [self::STORAGE_STRATEGY_SET, self::STORAGE_STRATEGY_INCREMENT];
                break;
            case $mapping['type'] == 'many':
                $defaultStrategy = CollectionHelper::DEFAULT_STRATEGY;
                $allowedStrategies = [self::STORAGE_STRATEGY_PUSH_ALL, self::STORAGE_STRATEGY_ADD_TO_SET, self::STORAGE_STRATEGY_SET, self::STORAGE_STRATEGY_SET_ARRAY, self::STORAGE_STRATEGY_ATOMIC_SET, self::STORAGE_STRATEGY_ATOMIC_SET_ARRAY];
                break;
            default:
                $defaultStrategy = self::STORAGE_STRATEGY_SET;
                $allowedStrategies = [self::STORAGE_STRATEGY_SET];
        }
        if (!isset($mapping['strategy'])) {
            $mapping['strategy'] = $defaultStrategy;
        }
        if (!in_array($mapping['strategy'], $allowedStrategies)) {
            throw MappingException::invalidStorageStrategy($this->name, $mapping['fieldName'], $mapping['type'], $mapping['strategy']);
        }
        if (isset($mapping['reference']) && $mapping['type'] === 'many' && $mapping['isOwningSide'] && !empty($mapping['sort']) && !CollectionHelper::usesSet($mapping['strategy'])) {
            throw MappingException::referenceManySortMustNotBeUsedWithNonSetCollectionStrategy($this->name, $mapping['fieldName'], $mapping['strategy']);
        }
    }