zxcms/common/modules/pages/forms/PageForm.php

<?php

namespace common\modules\pages\forms;

use core\components\LanguageDynamicModel;
use common\modules\pages\entities\Page;
use core\validators\SlugValidator;
use yii\db\ActiveQuery;
use yii\helpers\ArrayHelper;
use Yii;

class PageForm extends LanguageDynamicModel
{
	public $type;
    public $title;
    public $slug;
    public $content;
    public $parentId;

    public $meta_title;
    public $meta_description;
    public $meta_keywords;

    public $_page;

	public function __construct(Page $page = null, array $attributes = [], $config = [])
    {
        if ($page) {
            $this->slug = $page->slug;
            $this->parentId = $page->parent ? $page->parent->id : null;

            $this->_page = $page;
        }
	    parent::__construct( $page, $attributes, $config );
    }

    public function rules(): array
    {
    	return array_merge(
    		parent::rules(),
	        [
	            [['title'], 'required'],
	            [['parentId'], 'integer'],
	            [['title', 'slug', 'meta_title', 'meta_keywords'], 'string', 'max' => 255],
	            [['content', 'meta_description'], 'string'],
	            ['slug', SlugValidator::class],
		        [['slug'], 'unique', 'targetClass' => Page::class, 'filter' => function (ActiveQuery $query) {
			        if ($this->type != Page::TYPE_PUBLIC) {
				        $query->andWhere($this->type . '=' . Page::TYPE_PUBLIC);
			        }

			        $query->andWhere(['type' => Page::TYPE_PUBLIC]);
			        if ($this->_page) {
				        $query->andWhere(['<>', 'id', $this->_page->id]);
			        }
			        return $query;
		        }],
	        ]
	    );
    }

	public function attributeLabels() {
		return array_merge(
			parent::attributeLabels(),
			[
				'title' => Yii::t('pages', 'Title'),
				'slug' => Yii::t('pages', 'Slug'),
				'id' => Yii::t('pages', 'ID'),
				'content' => Yii::t('pages', 'Content'),
				'parentId' => Yii::t('pages', 'Parent Page'),
				'meta_title' => Yii::t('pages', 'META Title'),
				'meta_description' => Yii::t('pages', 'META Description'),
				'meta_keywords' => Yii::t('pages', 'META Keywords'),
			]
		);
	}

	public function attributeHints() {
		return array_merge(
			parent::attributeHints(),
			[
				'slug' => Yii::t('pages', 'SEO link will be generated automatically if not specified'),
			]
		);
	}

	public function parentsList(): array
    {
	    return ArrayHelper::map(Page::find()->andWhere(['tree' => 1])->orderBy('lft')->all(), 'id', function (Page $page) {
		    return ($page->depth > 1 ? str_repeat('-- ', $page->depth - 1) . ' ' : '') . ($page->translation ? $page->translation->title : Yii::t('pages', '- no parent -'));
	    });
    }
}