PartKeepr\SetupBundle\Services\UnitSetupService::importUnits PHP Method

    public function importUnits()
    {
        $path = $this->kernel->locateResource(self::UNIT_PATH . self::UNIT_DATA);
        $yaml = new Parser();
        $data = $yaml->parse(file_get_contents($path));
        $count = 0;
        $skipped = 0;
        foreach ($data as $unitName => $unitData) {
            $unit = $this->getUnit($unitName);
            if ($unit === null) {
                $unit = new Unit();
                $unit->setName($unitName);
                $unit->setSymbol($unitData['symbol']);
                if (array_key_exists('prefixes', $unitData)) {
                    if (!is_array($unitData['prefixes'])) {
                        throw new \Exception($unitName . " doesn't contain a prefix list, or the prefix list is not an array.");
                    }
                    foreach ($unitData['prefixes'] as $name) {
                        $prefix = $this->getSiPrefix($name);
                        if ($prefix === null) {
                            throw new \Exception('Unable to find SI Prefix ' . $name);
                        }
                        $unit->getPrefixes()->add($prefix);
                    }
                }
                $this->entityManager->persist($unit);
                $this->entityManager->flush();
                $count++;
            } else {
                $skipped++;
            }
        }
        return ['imported' => $count, 'skipped' => $skipped];
    }