Help with left join

Hi

I'm having a little problem with converting an old sql request to use
cakephp.

The sql is:
select name, if(module_id is null,0,1) activated from module left join
active_modules on (id = module_id and res_id = $id)

I have something like:
----
var $useTable = "modules";
var $belongsTo = array(
"active_modules" => array(
"className" => "ActiveModules",
"foreignKey" => "module_id",
)
);
---

not sure how to proceed. What do I do with "if(module_id is null,
0,1)" ?
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