<?php
class Forum_Board extends Doctrine_Record { 
    public function setTableDefinition() {
        $this->hasColumn("name", "string", 100);
        $this->hasColumn("description", "string", 5000);
    }
    public function setUp() {
        // notice the 'as' keyword here
        $this->ownsMany("Forum_Thread as Threads",  "Forum_Thread.board_id");
    }
}

class Forum_Thread extends Doctrine_Record {
    public function setTableDefinition() {
        $this->hasColumn("board_id", "integer", 10);
        $this->hasColumn("updated", "integer", 10);
        $this->hasColumn("closed", "integer", 1);
    }
    public function setUp() {
        // notice the 'as' keyword here
        $this->hasOne("Forum_Board as Board", "Forum_Thread.board_id");
    }
}
$board = new Board();
$board->Threads[0]->updated = time();
?>