yii2-save-relations-behavior/tests/models/ProjectLink.php

<?php

namespace tests\models;

class ProjectLink extends \yii\db\ActiveRecord
{

    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'project_link';
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['language', 'name', 'project_id'], 'required'],
            [['language', 'name'], 'unique']
        ];
    }

}