Yii2如何将模型的多个实例发送到一个表单？&将它们放回控制器中

use yii\data\ActiveDataProvider;
use app\models\Post;

public function actionIndex()
{
    $dataProvider = new ActiveDataProvider([
        'query' => Post::find(),
    ]);

    return $this->render('index', [
        'dataProvider' => $dataProvider,
    ]);
}

use yii\widgets\ActiveForm;
use yii\grid\GridView;

$form = ActiveForm::begin();

echo GridView::widget([
    'dataProvider' => $dataProvider,
    'columns' => [
        'id',
        'title',
        'content',
        [
            'class' => 'yii\grid\CheckboxColumn',
            'checkboxOptions' => function ($model) use ($form) {
                return ['value' => $model->id, 'form' => $form->id];
            },
        ],
    ],
]);

echo Html::submitButton('Submit', ['class' => 'btn btn-primary']);

ActiveForm::end();

public function actionSubmit()
{
    $selectedIds = Yii::$app->request->post('selection');

    // 根据选中的ID处理逻辑

    // 重定向到其他页面或显示成功消息
}