Yii2 rule array validation - validation

Question

I have 2 models A and B where A has many B.
Now i want to create multiple B at the same time(page).
Here is my codes.
B.php
...
public function rules()
{
return [
[['username', 'xx', 'yy'], 'required'],
[['xx', 'yy'], 'string'],
[['username'], 'string', 'max' => 255]
];
}
...
_form.php
<div class="b-form">
<?php $form = ActiveForm::begin(); ?>
<?php for ($i=0; $i < 3; $i++) {
?>
<h3>B #<?=$i+1?></h3>
<hr />
<?= $form->field($model, 'xx[]')->textInput(['maxlength' => true]) ?>
<?= $form->field($model, 'yy[]')->textInput(['maxlength' => true]) ?>
<?php
}
?>
<div class="form-group">
<?= Html::submitButton($model->isNewRecord ? 'Create' : 'Update', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
</div>
<?php ActiveForm::end(); ?>
</div>
I want to make those 6(3x2) text inputs responds individually and at least need 2 pairs of xx and yy to pass validation.
Now how do i build good rules to cover my needs?

Answer 1

There is dedicated section about it in official docs - Collecting Tabular Input.
Example of controller:
<?php
namespace app\controllers;
use Yii;
use yii\base\Model;
use yii\web\Controller;
use app\models\Setting;
class SettingsController extends Controller
{
// ...
public function actionUpdate()
{
$settings = Setting::find()->indexBy('id')->all();
if (Model::loadMultiple($settings, Yii::$app->request->post()) && Model::validateMultiple($settings)) {
foreach ($settings as $setting) {
$setting->save(false);
}
return $this->redirect('index');
}
return $this->render('update', ['settings' => $settings]);
}
}
Used methods:
Model::loadMultiple() - load post data into an array of models.
Model::validateMultiple() - validates an array of models.
There is more info, for example how to create a dynamic set of new records, use it if you need it.
Also, take a look to some extensions for easing work with multiple inputs, for example unclead/yii2-multiple-input or wbraganca/yii2-dynamicform.
I want to make those 6(3x2) text inputs responds individually and at
least need 2 pairs of xx and yy to pass validation.
This sounds weird, you should never trust and always validate ALL data coming from user.