Many To Many relations Yii2 - yii2

Question

I need help with this code, I'm new to Yii2.
I'm building a sample project to start, and I don't know why my code gets the right result but doesn't save the ids I need into the many-to-many table for the relationship.
I started from this sample in the wiki: https://www.yiiframework.com/wiki/708/book-has-author-many-to-many-relations-using-kartikselect2
My Model
public function rules()
{
return [
[['anno', 'durata', 'flagdelete', 'categoriaid'], 'integer'],
[['titolo', 'riassunto', 'regista', 'descrizione'], 'string', 'max' => 50],
[['attoriIds'], 'safe'],
];
}
public function attributeLabels()
{
return [
'titolo' => 'Titolo',
'anno' => 'Anno',
'durata' => 'Durata',
'riassunto' => 'Riassunto',
'regista' => 'Regista',
'descrizione' => 'Descrizione',
'categoriaid' => 'Categoria',
'nome' => 'Attori',
];
}
/**
* #var array
*/
public $attoriIds = [];
public function getdropAttori()
{
$data = Attori::find()->asArray()->all();
return ArrayHelper::map($data, 'id', 'nome');
}
/**
* #return mixed
*/
public function getAttoriIds()
{
return $this->attoriIds;
}
/**
* #param $attoriIds
*/
public function setAttoriIds($attoriIds)
{
$this->attoriIds = \yii\helpers\ArrayHelper::getColumn(
$this->getAttdvd()->asArray()->all(),
'attori_id'
);
}
/**
* #param $insert
* #param $changedAttributes
*/
public function afterSave($insert, $changedAttributes)
{
$actualAttoris = [];
$attoriExists = 0;
if (($actualAttoris = Attdvd::find()->andWhere(
"dvd_id = $this->id"
)->asArray()->all()) !== null
) {
$actualAttoris = ArrayHelper::getColumn($actualAttoris, 'attori_id');
$attoriExists = 1;
}
if (!empty($this->despIds)) {
foreach ($this->despIds as $id) {
$actualAttoris = array_diff($actualAttoris, [$id]);
$r = new Attdvd();
$r->dvd_id = $this->id;
$r->attori_id = $id;
$r->save();
}
}
if ($attoriExists == 1) {
foreach ($actualAttoris as $remove) {
$r = Attdvd::findOne(
['attori_id' => $remove, 'dvd_id' => $this->id]
);
$r->delete();
}
}
parent::afterSave($insert, $changedAttributes);
}
/**
* #return mixed
*/
public function getAttdvd()
{
return $this->hasMany(Attori::className(), ['id' => 'attori_id'])->viaTable(
'attdvd', ['dvd_id' => 'id']
);
}
My Controller
public function actionCreate()
{
$model = new Dvd();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
}
return $this->render('create', [
'model' => $model,
]);
}
public function actionUpdate($id)
{
$model = $this->findModel($id);
//i think the problem is the line below
$model->attoriIds = $model->AttoriIds;
if ($model->load(Yii::$app->request->post()) && $model->save()) {
return $this->redirect(['view', 'id' => $model->id]);
}
return $this->render('update', [
'model' => $model,
]);
}
My form (that work properly):
<?= $form->field($model, 'AttoriIds')->widget(Select2::classname(), ['data'=>$model->dropAttori, 'options' => ['multiple' => true, 'placeholder' => 'Seleziona attori']])->label('Attori') ?>

Answer 1

It's bad way because the making of that code in multiple models will make models dirtier. The better way is usage of a universal component that can manage relations in your models. For example yii2-many-to-many-behavior