Kohana ORM - Incorrect table name - php

Question

I have a weird problem with the Kohana (3.2) ORM query builder and i can't figure out what is wrong. I get "Incorrect table name" exception:
Database_Exception [ 1103 ]: Incorrect table name '' [ SELECT ``.* FROM `` JOIN `user_plugins` ON (`user_plugins`.`plugin_id` = ``.`id`) WHERE `user_plugins`.`user_id` = '9' ]
As you can see the table is empty in the query.
Controller:
$user = ORM::factory('user', Auth::instance()->get_user()->id);
if ($user->loaded() )
{
$result = $user->plugin->find_all();
}
User model:
class Model_User extends Useradmin_Model_User
{
protected $_has_many = array(
'plugin' => array( 'through' => 'user_plugins'),
);
...
user_plugin Model
class Model_user_plugin extends ORM
{
protected $_belongs_to = array(
'plugin' => array(),
'user' => array()
);
...
plugin Model
class Model_Plugin extends ORM
{
protected $_has_many = array(
'user' => array('through' => 'user_plugins')
);
...
Anyone got any idea what could be wrong here?
Any help is very appreciated!

Answer 1

This is how User Model should be
class Model_User extends Useradmin_Model_User
{
protected $_has_many = array(
'plugin' => array('model' => 'plugin', 'through' => 'user_plugins'),
);
...
This is how Plugin Model should be
class Model_Plugin extends ORM
{
protected $_has_many = array(
'user' => array('model' => 'user', 'through' => 'user_plugins')
);
You don't need user_plugin Model at all, the "user_plugins" in both models refers to the table name, not the model name. Just make sure you have the table with user_plugins that have following fields,
id, user_id, plugin_id
I hope this helps.

Answer 2

The $_has_many, by convention, must always use plural names, unless you specify the name in $_object_name in the target model. So it should be:
class Model_Plugin extends ORM
{
protected $_has_many = array(
'users' => array('through' => 'users_plugins')
);
//...
class Model_User extends ORM
{
protected $_has_many = array(
'plugins' => array('through' => 'users_plugins')
);
//...
class Model_user_plugin extends ORM
{
protected $_belongs_to = array(
'plugin' => array(),
'user' => array()
);
//...