Criteria Bidirectional Join?

Question

I'm working on a symfony1.4 project, with propel ORM. In my model, I have a table where its elements can be linked with many elements of the same table, by another table (link table). Some code will explain better:

table1:
    id_element: integer;
    [...]

and the link table:

 link_table:
     id1: fk to table1;
     id2: fk to table1;

I need to build a query with Propel Criteria that returns me all the related elements with an specific element. The problem is that the element I want to specify, can be as in id1 field as in id2 field of the link table.

now some of my criteria definition code (not working obviously)

$c = new Criteria();
$c->addJoin($linkTable::ID1,$table::ID);
$c->addJoin($linkTable::ID2,$table::ID);
$c->addOr($linkTable::ID1,$specific_id);
$c->addOr($linkTable::ID2,$specific_id);
$result = $table->doSelect($c);

and this is a SQL like that I want to generate:

SELECT * FROM table
    WHERE table.ID IN
        (SELECT link_table.ID1 FROM link_table
            WHERE link_table.ID2 = "the id that I want"
        )
    OR table.ID IN 
        (SELECT link_table.ID2 FROM link_table
            WHERE link_table.ID1 = "the id that I want"
        )

So must I do 2 joins, one for each side of the link table? is there a way to do an "or-join"?

Answer 1

at last i found a way to do it using criteria:

$c = new Criteria();
    $q1 = new Criteria();
    $q1->add($linkPeer::ID1,$my_value);
    result1 = $linkPeer->doSelect($q1);
    foreach($result1 as $result){
        ids1[] = $result->getID();
    }
    $q2 = new Criteria();
    $q2->add($linkPeer::ID2,$my_value);
    result2 = $linkPeer->doSelect($q2);
    foreach($result2 as $result){
        ids2[] = $result->getID();
    }
$ids = array_merge($ids1,$ids2);
$c->add($tablePeer::ID,$ids,Criteria::IN);
$totalResult = $tablePeer->doSelect($c);

maybe not the best way but working fine.

Thank you very much for your answers!!