CategoryWithFieldsModel.php

<?php
namespace yii\easyii\components;
use yii\easyii\behaviors\JsonColumns;
use yii\easyii\behaviors\SortableModel;

/**
 * Extended CategoryModel with fields. Shared by categories
 * @package yii\easyii\components
 * @inheritdoc
 */
class CategoryWithFieldsModel extends CategoryModel
{
    const FIELD_TYPE_STRING = 'string';
    const FIELD_TYPE_TEXT = 'text';
    const FIELD_TYPE_HTML = 'html';
    const FIELD_TYPE_BOOLEAN = 'boolean';
    const FIELD_TYPE_SELECT = 'select';
    const FIELD_TYPE_CHECKBOX = 'checkbox';
    const FIELD_TYPE_FILE = 'file';
    const FIELD_TYPE_DATE = 'date';
    const FIELD_TYPE_ADDRESS = 'address';
    
    public static $FIELD_TYPES = [
        self::FIELD_TYPE_STRING => 'String',
        self::FIELD_TYPE_TEXT => 'Text',
        self::FIELD_TYPE_HTML => 'Html',
        self::FIELD_TYPE_BOOLEAN => 'Boolean',
        self::FIELD_TYPE_SELECT => 'Select',
        self::FIELD_TYPE_CHECKBOX => 'Checkbox',
        self::FIELD_TYPE_FILE => 'File',
        self::FIELD_TYPE_DATE => 'Date',
        self::FIELD_TYPE_ADDRESS => 'Address'
    ];

    public static $FIELDS_WITH_OPTIONS = [
        self::FIELD_TYPE_SELECT,
        self::FIELD_TYPE_CHECKBOX,
        self::FIELD_TYPE_FILE,
        self::FIELD_TYPE_ADDRESS
    ];

    public $parent_id;

    public function rules()
    {
        return array_merge([
            ['fields', 'safe'],
        ], parent::rules());
    }

    public function behaviors()
    {
        return array_merge(parent::behaviors(), [
            'jsonColumns' => [
                'class' => JsonColumns::className(),
                'columns' => ['fields']
            ]
        ]);
    }

    public function getFieldByName($name)
    {
        foreach($this->fields as $field){
            if($field->name == $name){
                return $field;
            }
        }
        return null;
    }

    public function create($parent_id = null)
    {
        if ($parent_id && ($parentCategory = static::findOne($parent_id))) {
            $this->fields = $parentCategory->fields;
            $this->order_num = $parentCategory->order_num;
            $this->appendTo($parentCategory);
        } else {
            $this->attachBehavior('sortable', SortableModel::className());
            $this->makeRoot();
        }
        return $this->hasErrors() ? false : true;
    }
}