banki.test/models/Parameter.php

<?php

namespace app\models;

use Yii;
use yii\db\ActiveQuery;

/**
 * This is the model class for table "parameters".
 *
 * @property int $id
 * @property string $title
 * @property int $type
 */
class Parameter extends \yii\db\ActiveRecord
{
    /**
     * {@inheritdoc}
     */
    public static function tableName()
    {
        return 'parameters';
    }

    public function getIcon()
    {
        return $this->hasOne(Image::class, [ 'id' => 'icon' ]);
    }

    public function getIconGray()
    {
        return $this->hasOne(Image::class, [ 'id' => 'icon_gray' ]);
    }

    public function fields()
    {
        $fields = parent::fields();

        $fields['icon'] = function (Parameter $parameter) {
            return $parameter->relatedRecords['icon'];
        };

        $fields['icon_gray'] = function (Parameter $parameter) {
            return $parameter->relatedRecords['iconGray'];
        };

        return $fields;
    }

    /**
     * {@inheritdoc}
     */
    public function rules()
    {
        return [
            [['title', 'type'], 'required'],
            [['type'], 'integer', 'min' => 1, 'max' => 2],
            [['title'], 'string', 'max' => 255],
        ];
    }

    /**
     * {@inheritdoc}
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'title' => 'Title',
            'type' => 'Type (either 1 or 2)',
            'icon' => 'Icon',
            'icon_gray' => 'Gray icon',
        ];
    }
}