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$niveau = Doctrine::getTable('Niveaus')
    ->findOneByProfilIdAndKompetenzId(
        $profil_id, $id
);
$niveau->setNiveau(20); // Es sind nur Werte im Bereich 1-5 erlaubt
$niveau->isValid();     // gibt dennoch true zurück

// lib/vendor/symfony/lib/plugins/sfDoctrinePlugin/config/sfDoctrinePluginConfiguration.class.php
 
$manager = Doctrine_Manager::getInstance();
...
$manager->setAttribute(Doctrine_Core::ATTR_VALIDATE, Doctrine_Core::VALIDATE_NONE);

$niveau->isValid();

// lib/vendor/symfony/lib/plugins/sfDoctrinePlugin/lib/vendor/doctrine/Doctrine/Record.php
 
/**
 * tests validity of the record using the current data.
 *
 * @param boolean $deep   run the validation process on the relations
 * @param boolean $hooks  invoke save hooks before start
 * @return boolean        whether or not this record is valid
 */
public function isValid($deep = false, $hooks = true)
{
    if ( ! $this->_table->getAttribute(Doctrine_Core::ATTR_VALIDATE)) {
        return true;
    }
...

// config/ProjectConfiguration.class.php 
 
// configure doctrine engine
public function configureDoctrine(Doctrine_Manager $manager) {
    // enable validation for doctrine records
    $manager->setAttribute(Doctrine_Core::ATTR_VALIDATE, Doctrine_Core::VALIDATE_ALL);
}