cakephp/cakephp — comment on commit b4faa00703d45567d714122930bdd3a96ad3663c
File: lib/Cake/Model/Model.php line 2821
By renansaddam:

Would be nice if you could also define the parent field.
There is a chance to do it automatically, by checking belongsTo relationships using the same model, but its not 100%.

Having a parent_field key would solve it, eg:
```
$thread = $Apple->find('threaded', array('parent_field' => 'thread_id'));
```