Yii2 multiple upload on another model - yii2

Question

I need help building a simple protocol form with multiple attachments, where the user can change these attachments (files) later. That is, the attachments must have binding to a protocol.
(In this case I created 2 tables: mod_protocol and mod_files)
How should my code stay so that when I insert a new form, the attachments of this form are written to the mod_files table? (I'm not sure how to build a loop to write the files)
I'm at the beginning of this project, check out my files:
protocol form
<div class="protocol-form">
<?php $form = ActiveForm::begin(); ?>
<?= $form->field($model, 'title')->textInput(['maxlength' => true]) ?>
<?= $form->field($model, 'description')->textarea(['rows' => 8]) ?>
<?= $form->field($model, 'files[]')->fileInput(['multiple' => true,]) ?>
<div class="form-group">
<?= Html::submitButton($model->isNewRecord ? 'Save' : 'Save', ['class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-primary']) ?>
</div>
<?php ActiveForm::end(); ?>
</div>
protocol model
<?php
namespace app\modules\protocol\models;
use Yii;
class Protocol extends \yii\db\ActiveRecord
{
public static function tableName()
{
return 'mod_protocol';
}
public function rules()
{
return [
[['name'], 'required'],
[['name','description'], 'string', 'max' => 200],
];
}
public function attributeLabels()
{
return [
'id' => 'ID',
'name' => 'Nome',
'description' => 'Descrição'
];
}
}
protocol controlller
public function actionCreate()
{
$model = new Protocol();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
} else {
return $this->render('create', [
'model' => $model,
]);
}
}
files model
<?php
namespace app\modules\protocol\models;
use Yii;
class Files extends \yii\db\ActiveRecord
{
public static function tableName()
{
return 'mod_files';
}
public function rules()
{
return [
[['filename','protoco_id'], 'safe'],
];
}
public function attributeLabels()
{
return [
'id' => 'ID',
'filename' => 'Nome do Arquivo',
'protoco_id' => 'Protocolo'
];
}
}

Answer 1

So if file is an array:
use yourapp/model/ModFile;
...
public function actionCreate()
{
$model = new Protocol();
// I would write some logic, verify this saves first.
foreach($model->files as $file) {
$model_file = new ModFile();
$model_file->file = $file;
$model_file->save();
}
// If successful then save the main model.
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
} else {
return $this->render('create', [
'model' => $model,
]);
}
}