PagesController.php

<?php
public function edit($id = null)
    {
        $page = $this->Pages->get($id, [
            'contain' => []
        ]);
        if ($this->request->is(['patch', 'post', 'put'])) {
            $page = $this->Pages->patchEntity($page, $this->request->data);
            if ($this->Pages->save($page)) {
                $this->Flash->success(__('The page has been saved.'));
                return $this->redirect(['action' => 'index']); //not redirecting to index
            } else {
                $this->Flash->error(__('The page could not be saved. Please, try again.'));
            }
        }
        $parentPages = $this->Pages->ParentPages->find('list', ['limit' => 200]);
        $this->set(compact('page', 'parentPages'));
        $this->set('_serialize', ['page']);
    }