issue when changing the connection inside Doctrine_Query::preQuery() on a model using a behavior

We were following:
http://www.doctrine-project.org/documentation/cookbook/1_1/en/master-and-slave-connections

class MyQuery extends Doctrine_Query
{
// Since php doesn't support late static binding in 5.2 we need to override
// this method to instantiate a new MyQuery instead of Doctrine_Query
public static function create($conn = null)

{ return new MyQuery($conn); }

public function preQuery()
{
// If this is a select query then set connection to one of the slaves
if ($this->getType() == Doctrine_Query::SELECT)

{ $this->_conn = Doctrine_Manager::getInstance()->getConnection('slave_' . rand(1, 4)); // All other queries are writes so they need to go to the master }

else

{ $this->_conn = Doctrine_Manager::getInstance()->getConnection('master'); }

}
}

However we are actually forcing all queries after the first access to the master to be run against the master (including selects). Note the example should probably be changed to use setConnection(). However even when using setConnection() it seems like changing the connection can cause issues when running a select on a model with a behavior (in our case we were using i18n). Therefore we believe there is some issue that is caused through the event system, because otherwise queries work just fine even when changing the connection as per the above described code.

We managed to fix things, by not setting the connection explicitly and instead simply using setCurrentConnection('master'), so the bug does not affect us anymore. However this seems to indicate some issues deep inside the event-behavior-template code.