TagsController.php

<?php
namespace App\Controller;

use App\Controller\AppController;
use Cake\ORM\TableRegistry;
use Cake\Routing\Router;

/**
 * Tags Controller
 *
 * @property \App\Model\Table\TagsTable $Tags
 */
class TagsController extends AppController
{
    public $components = ['Ajax.Ajax'];

    public function initialize()
    {
        parent::initialize();
        $this->Security->config('unlockedActions', ['getDataAjax']);
    }

    /**
     * Richiesta ajax per ricerca Tags
     *
     * Parametri:
     * - scope: intero o array di interi che indica lo scope dei tags desiderati
     * - query: digitazione dell'utente
     *
     * @return type
     */
    public function getDataAjax()
    {
        // Carico il componente ajax
        $this->loadComponent('Ajax.Ajax', [
            'flashKey' => false
        ]);

        $this->request->allowMethod('ajax');

        $tags = $this->Tags->find()->select(['Tags.id', 'Tags.tag_name']);

        if (!empty($this->request->query['scope'])) {
            if (!is_array($this->request->query['scope'])) {
                $this->request->query['scope'] = [$this->request->query['scope']];
            }
            $tags->where(['Tags.scope' => $this->request->query['scope']], ['Tags.scope' => 'integer[]']);
        }

        if (!empty($this->request->params['query'])) {
            $tags->where(['Tags.tag_name LIKE' => '%' . $this->request->query['query'] . '%']);
        }

        $data = $tags->order('Tags.tag_name ASC')->toArray();

        $this->set(compact('data'));
        $this->set('_serialize', ['data']);
    }
}