Self Join Problem

Hi All,

I' ve got a problem with my self-join association. My model looks like
this:

<?php

class Project extends AppModel{
var $name = 'Project';

var $belongsTo = array(
'Assembly' => array(
'className' => 'Assembly',
'foreignKey' => 'assembly_id'
),

'Linker' => array(
'className' => 'Linker',
'foreignKey' => 'linker_id'
),

'Vector' => array(
'className' => 'Vector',
'foreignKey' => 'vector_id'
),

'User' => array(
'className' => 'User',
'foreignKey' => 'user_id'
)
);

var $hasMany = array(
'Child' => array(
'className' => 'Project',
'foreignKey' =>'parent_id'
)
);

var $hasOne = array(
'Precursor' => array(
'className' => 'Project',
'foreignKey' => false,
'conditions' => array('Project.parent_id' => 'Precursor.id')
)
);
}
?>

The corresponding Controller-Part is following:

function view($id){

$project = $this->Project->read(null , $id);
$this->set('project', $project);
}

When I request the corresponding Array, i get this:

Array
(
[Project] => Array
(
[id] => 2
[parent_id] => 1
[name] => test_project_1
[created] => 2009-12-02 09:09:00
[trail_purpose] => testing
[description] => testing the self-join
[assembly_id] => 1
[user_id] => 18
[vector_id] => 1
[linker_id] => 1
)

[Assembly] => Array
(
[id] => 1
[name] => hg19
[genome] => human
[release_date] => 2009-02-01
[alternative_name] => GRCh37
)

[Linker] => Array
(
[id] => 1
[name] => test_linker
[sequence] => CCTAACTGCTGTGCCACT
[group_id] => 1
)

[Vector] => Array
(
[id] => 1
[name] => test_lenti
[type] => lenti
[lam_direction] => 5
[version] => 1
[sequence] => AAGGGTCTCGAGGATTCGAT
[ltr_id] => 3
[group_id] => 1
)

[User] => Array
(
[id] => 18
[first_name] => Tester
[last_name] => Testing
[login_name] => testUser
[password] => testing
[email] => test@test-db.com
[gender] => male
[degree] => none
[last_login] => 2009-12-02 07:57:07
[create_time] => 2009-12-02 07:57:07
[access_level] => read_only
[deleted] => 0
[group_id] => 1
)

[Precursor] => Array
(
[id] =>
[parent_id] =>
[name] =>
[created] =>
[trail_purpose] =>
[description] =>
[assembly_id] =>
[user_id] =>
[vector_id] =>
[linker_id] =>
)

[Child] => Array
(
)

)

You can see, that the self join relation could not be dissolved. So, I
could not display the name of the precursor as I want. Where is my
mistake.

Thank you in advance for your effort.

Thx, soleil83

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