/**
* Set whether secondary read queries are allowed for this collection.
*
* This method wraps setSlaveOkay() for driver versions before 1.3.0. For
* newer drivers, this method wraps setReadPreference() and specifies
* SECONDARY_PREFERRED.
*
* @see http://php.net/manual/en/mongocollection.setreadpreference.php
* @see http://php.net/manual/en/mongocollection.setslaveokay.php
* @param boolean $ok
* @return boolean Previous slaveOk value
*/
public function setSlaveOkay($ok = true)
{
if (version_compare(phpversion('mongo'), '1.3.0', '<')) {
return $this->mongoCollection->setSlaveOkay($ok);
}
$prevSlaveOkay = $this->getSlaveOkay();
if ($ok) {
// Preserve existing tags for non-primary read preferences
$readPref = $this->getReadPreference();
$tags = !empty($readPref['tagsets']) ? $readPref['tagsets'] : array();
$this->mongoCollection->setReadPreference(\MongoClient::RP_SECONDARY_PREFERRED, $tags);
} else {
$this->mongoCollection->setReadPreference(\MongoClient::RP_PRIMARY);
}
return $prevSlaveOkay;
}
