<?php
/**
 * @package     Joomla.API
 * @subpackage  com_categories
 *
 * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Categories\Api\View\Categories;

\defined('_JEXEC') or die;

use Joomla\CMS\MVC\View\JsonApiView as BaseApiView;
use Joomla\CMS\Router\Exception\RouteNotFoundException;
use Joomla\Component\Fields\Administrator\Helper\FieldsHelper;

/**
 * The categories view
 *
 * @since  4.0.0
 */
class JsonapiView extends BaseApiView
{
	/**
	 * The fields to render item in the documents
	 *
	 * @var  array
	 * @since  4.0.0
	 */
	protected $fieldsToRenderItem = [
		'id',
		'title',
		'alias',
		'note',
		'published',
		'access',
		'checked_out',
		'checked_out_time',
		'created_user_id',
		'parent_id',
		'level',
		'extension',
		'lft',
		'rgt',
		'language',
		'language_title',
		'language_image',
		'editor',
		'access_level',
		'author_name',
		'count_trashed',
		'count_unpublished',
		'count_published',
		'count_archived',
	];

	/**
	 * The fields to render items in the documents
	 *
	 * @var  array
	 * @since  4.0.0
	 */
	protected $fieldsToRenderList = [
		'id',
		'title',
		'alias',
		'note',
		'published',
		'access',
		'checked_out',
		'checked_out_time',
		'created_user_id',
		'parent_id',
		'level',
		'lft',
		'rgt',
		'language',
		'language_title',
		'language_image',
		'editor',
		'access_level',
		'author_name',
		'count_trashed',
		'count_unpublished',
		'count_published',
		'count_archived',
	];

	/**
	 * Execute and display a template script.
	 *
	 * @param   array|null  $items  Array of items
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	public function displayList(array $items = null)
	{
		foreach (FieldsHelper::getFields('com_content.categories') as $field)
		{
			$this->fieldsToRenderList[] = $field->name;
		}

		return parent::displayList();
	}

	/**
	 * Execute and display a template script.
	 *
	 * @param   object  $item  Item
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	public function displayItem($item = null)
	{
		foreach (FieldsHelper::getFields('com_content.categories') as $field)
		{
			$this->fieldsToRenderItem[] = $field->name;
		}

		if ($item === null)
		{
			/** @var \Joomla\CMS\MVC\Model\AdminModel $model */
			$model = $this->getModel();
			$item  = $this->prepareItem($model->getItem());
		}

		if ($item->id === null)
		{
			throw new RouteNotFoundException('Item does not exist');
		}

		if ($item->extension != $this->getModel()->getState('filter.extension'))
		{
			throw new RouteNotFoundException('Item does not exist');
		}

		return parent::displayItem($item);
	}

	/**
	 * Prepare item before render.
	 *
	 * @param   object  $item  The model item
	 *
	 * @return  object
	 *
	 * @since   4.0.0
	 */
	protected function prepareItem($item)
	{
		foreach (FieldsHelper::getFields('com_content.categories', $item, true) as $field)
		{
			$item->{$field->name} = isset($field->apivalue) ? $field->apivalue : $field->rawvalue;
		}

		return parent::prepareItem($item);
	}
}

• [F] JsonapiView.php
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