some search problem with many table

i want create some search system:
this is some example:
i want show some user with 'Usercat.subcat_id' =>
2,'User.shahr_id'=>576

in usercat model i have:

var $belongsTo = array(
'User' => array(
'className' => 'User',
'foreignKey' => 'user_id',
'conditions' => '',
'fields' => '',
'order' => ''
));

in User model i have:

var $hasMany = array('Usercat');

now i have SearchController,in SearchController i have:

var $uses = array('Usercat','User');

and in search model i have:

class Search extends AppModel {
var $name = "Search";
var $useTable = false;
}

and in index function in SearchController i have:

$res = $this->Usercat->User->find('all', array('conditions' =>
array('Usercat.subcat_id' => 2,'User.shahr_id'=>576)));

when i am test i have this error:

SQL Error: 1054: Unknown column 'Usercat.subcat_id' in 'where
clause' [CORE\cake\libs\model\datasources\dbo_source.php, line 673]

$out = null;
if ($error) {
trigger_error('<span style="color:Red;text-
align:left"><b>' . __('SQL Error:', true) . "</b> {$this->error}</
span>", E_USER_WARNING);

$sql = "SELECT `User`.`id`, `User`.`user_group_id`, `User`.`username`,
`User`.`password`, `User`.`email`, `User`.`phone`, `User`.`mobile`,
`User`.`website`, `User`.`active`, `User`.`first_name`,
`User`.`last_name`, `User`.`ostan_id`, `User`.`shahr_id`,
`User`.`views`, `User`.`sex`, `User`.`coname`, `User`.`coadress`,
`User`.`coid`, `User`.`imagecount`, `User`.`videocount`,
`User`.`exdate`, `User`.`created` FROM `users` AS `User` WHERE
`Usercat`.`subcat_id` = 2 AND `User`.`shahr_id` = 576 "
$error = "1054: Unknown column 'Usercat.subcat_id' in 'where clause'"
$out = null

Query: SELECT `User`.`id`, `User`.`user_group_id`, `User`.`username`,
`User`.`password`, `User`.`email`, `User`.`phone`, `User`.`mobile`,
`User`.`website`, `User`.`active`, `User`.`first_name`,
`User`.`last_name`, `User`.`ostan_id`, `User`.`shahr_id`,
`User`.`views`, `User`.`sex`, `User`.`coname`, `User`.`coadress`,
`User`.`coid`, `User`.`imagecount`, `User`.`videocount`,
`User`.`exdate`, `User`.`created` FROM `users` AS `User` WHERE
`Usercat`.`subcat_id` = 2 AND `User`.`shahr_id` = 576

1. i want fix this error
2.after i fix this error how can i send data for paginate?

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