creating soap server on cakephp 2.x and following this tutorial http://mykm.wordpress.com/2008/01/23/implementing-soap-server-on-cakephp/#comment-136

PostsController.php

<?php

App::uses('AppController', 'Controller');
App::uses('Post', 'Model'); //this is important don't forget to add this

/**
 * Posts Controller
 *
 * @property Post $Post
 */
class PostsController extends AppController {

  var $components = array('RequestHandler');

/**
 * index method
 *
 * @return void
 */
	public function index() {
		$this->Post->recursive = 0;
		$this->set('posts', $this->paginate());
	}

/**
 * view method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
	public function view($id = null) {
		if (!$this->Post->exists($id)) {
			throw new NotFoundException(__('Invalid post'));
		}
		$options = array('conditions' => array('Post.' . $this->Post->primaryKey => $id));
		$this->set('post', $this->Post->find('first', $options));
	}

/**
 * add method
 *
 * @return void
 */
	public function add() {
		if ($this->request->is('post')) {
			$this->Post->create();
			if ($this->Post->save($this->request->data)) {
				$this->Session->setFlash(__('The post has been saved'));
				$this->redirect(array('action' => 'index'));
			} else {
				$this->Session->setFlash(__('The post could not be saved. Please, try again.'));
			}
		}
	}

/**
 * edit method
 *
 * @throws NotFoundException
 * @param string $id
 * @return void
 */
	public function edit($id = null) {
		if (!$this->Post->exists($id)) {
			throw new NotFoundException(__('Invalid post'));
		}
		if ($this->request->is('post') || $this->request->is('put')) {
			if ($this->Post->save($this->request->data)) {
				$this->Session->setFlash(__('The post has been saved'));
				$this->redirect(array('action' => 'index'));
			} else {
				$this->Session->setFlash(__('The post could not be saved. Please, try again.'));
			}
		} else {
			$options = array('conditions' => array('Post.' . $this->Post->primaryKey => $id));
			$this->request->data = $this->Post->find('first', $options);
		}
	}

/**
 * delete method
 *
 * @throws NotFoundException
 * @throws MethodNotAllowedException
 * @param string $id
 * @return void
 */
	public function delete($id = null) {
		$this->Post->id = $id;
		if (!$this->Post->exists()) {
			throw new NotFoundException(__('Invalid post'));
		}
		$this->request->onlyAllow('post', 'delete');
		if ($this->Post->delete()) {
			$this->Session->setFlash(__('Post deleted'));
			$this->redirect(array('action' => 'index'));
		}
		$this->Session->setFlash(__('Post was not deleted'));
		$this->redirect(array('action' => 'index'));
	}

	function service() {
		$this->layout = false;
		$this->autoRender = false;
		Configure::write('debug', 0);
		ini_set("soap.wsdl_cache_enabled", "0"); // disabling WSDL cache
		$server = new SoapServer('http://localhost/blogpostsoapserver/posts/wsdl');
		$server->setClass("Post");
		$server->handle();
	}

	function wsdl() {
		$this->layout = false;
		Configure::write('debug', 0);
		$this->RequestHandler->respondAs('xml');
	}

}