cant find a field

Hi, Is this is the correct way to find a 1 field in 1 row of data?
I just want the teacherID of a row of a given  userID but I never get a match

$currentuserid=AuthComponent::user('id');
    
     $teacherid=$this->Teacher->find('first',array(
         'conditions' => array('Teacher.user_id' => $currentuserid),
          'fields' => array('Teacher.id'),
         ));

        if ( $teacherid==$id ){.........//never matches when it should

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