System preferences are a simple key => value mechanism, where the developer can specify the key and value himself. Note that values are stored internally as serialized PHP values to keep their type.
SystemPreference Class Documentation
Exemplo n.º 1
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 /**
  * Creates or updates a preference for a given user.
  *
  * @param string $key   The key to set
  * @param string $value The value to set
  *
  * @return SystemPreference The user preference
  */
 public function setSystemPreference($key, $value)
 {
     $dql = 'SELECT sp FROM PartKeepr\\SystemPreferenceBundle\\Entity\\SystemPreference sp WHERE sp.preferenceKey = :key';
     $query = $this->entityManager->createQuery($dql);
     $query->setParameter('key', $key);
     try {
         $systemPreference = $query->getSingleResult();
     } catch (\Exception $e) {
         $systemPreference = new SystemPreference();
         $systemPreference->setPreferenceKey($key);
         $this->entityManager->persist($systemPreference);
     }
     $systemPreference->setPreferenceValue($value);
     $this->entityManager->flush();
     return $systemPreference;
 }