Don't understand relational data setup

Yii 2.0 General Discussions
1

I am new to Yii2 and new to MVC so im trying to grasp the concept of things. I am trying setup some relational data so it can be viewed correctly. How do i get the output of the view(index.php) to link up and display the ‘population.population_number’ along side the country_name and the country_code?

table "country"

code, name, population

AU, Australia, 10

table "population"

id, population_id, population_number

1, 10, 10264

My model (Country.php)




namespace frontend\models;


use yii\db\ActiveRecord;


class Country extends ActiveRecord

{

    

}

My Controller (CountryController)




namespace frontend\controllers;


use yii\web\Controller;

use yii\data\Pagination;

use frontend\models\Country;


class CountryController extends Controller

{

    public function actionIndex()

    {

        $query = Country::find();


        $pagination = new Pagination([

            'defaultPageSize' => 5,

            'totalCount' => $query->count(),

        ]);


        $countries = $query->orderBy('name')

            ->offset($pagination->offset)

            ->limit($pagination->limit)

            ->all();


        return $this->render('index', [

            'countries' => $countries,

            'pagination' => $pagination,

        ]);

    }

}

My View (index.php)




use yii\helpers\Html;

use yii\widgets\LinkPager;

?>

<h1>Countries</h1>

<ul>

<?php foreach ($countries as $country): ?>

    <li>

        <?= Html::encode("{$country->name} ({$country->code})") ?>

    </li>

<?php endforeach; ?>

</ul>


<?= LinkPager::widget(['pagination' => $pagination]) ?>