cakePHP App Class

If you want to use other models in a different controller, use App::import().
http://book.cakephp.org/2.0/en/core-utility-libraries/app.html
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public function index() {
      App::import('Model','User');
      $this->User= new User;
      $this->set('users', $this->User->find('all'));
}
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