find.php

<?php

public function specificAccessSpeeds() {
  	$specificAccessType_id = $this->request->data['Service']['specific_access_type_id'];

		$Model = ClassRegistry::init('SpecificAccessTypesAccessSpeed');
		$Model->virtualFields['custom'] = 'AccessSpeed.name';
		$specificAccessSpeeds = $Model->find( 'list', array(
				'conditions' => array( 'SpecificAccessTypesAccessSpeed.specific_access_type_id' => $specificAccessType_id ),
				'recursive' => -1,
				'fields' => array('access_speed_id', 'custom')
			));

		//debug($specificAccessSpeeds);
		$this->set('specificAccessSpeeds', $specificAccessSpeeds );
		$this->layout = 'ajax';
	}