public function getAppliedMigrations( )
    {
        $query = "SELECT * FROM $this->migrationTable";
        
        $applied = $this->db->query( $query );
        
        $list = array();
        
        foreach( $applied as $mig )
        {
            $list[] = $mig[ 'migration_name' ];
        }
        
        $list = array_reverse( $list );
        
        return $this->filter( self::ON_GET_APPLIED_MIGRATIONS_FILTER, $list );
    }