Sokil\Mongo\Database::readPrimaryPreferred PHP Méthode

    public function readPrimaryPreferred(array $tags = null)
    {
        $this->getMongoDB()->setReadPreference(\MongoClient::RP_PRIMARY_PREFERRED, $tags);
        return $this;
    }

 public function testReadPrimaryPreferred()
 {
     $this->database->readPrimaryPreferred(array(array('dc' => 'kyiv'), array('dc' => 'lviv')));
     $this->assertEquals(array('type' => \MongoClient::RP_PRIMARY_PREFERRED, 'tagsets' => array(array('dc' => 'kyiv'), array('dc' => 'lviv'))), $this->database->getReadPreference());
 }