Define multiple scenarios and validate with multiple scenarios in Yii 2 model - yii2

Question

In model I have defined multiple scenarios:
public function rules() {
return [
[['in_quantity'], 'required','on'=>['stockIn']],
[['out_quantity'], 'required','on'=>['stockOut']],
];
}
Is it possible to use both scenario stockIn and stockOut for single model validation?
$StockModel->scenario[] = 'stockOut';
$StockModel->scenario[] = 'stockIn';
or
$StockModel->scenario = ['stockOut','stockIn'];

Answer 1

You can't have multiple scenarios for model. But you can have multiple scenarios for rule:
public function rules() {
return [
[['in_quantity'], 'required', 'on' => ['stockIn', 'stockOut']],
[['out_quantity'], 'required', 'on' => ['stockIn', 'stockOut']],
];
}
If you need multiple scenarios for model, it means that you're overusing scenarios feature.
Also note that it is not recommended to use too many scenarios in one model - scenarios work fine for simple cases, but more complicated cases should be handled by separate models for each scenario.

Answer 2

You can create multiple scenarios this way in model
class MyModel extends \yii\db\ActiveRecord {
const SCENARIO_CREATE = 'scenario_create';
const SCENARIO_UPDATE = 'scenario_update';
// get scenarios
public function scenarios()
{
return [
self::SCENARIO_CREATE => ['user_id', 'name', 'desc', 'published','date_create'],
self::SCENARIO_UPDATE => ['user_id', 'name', 'desc', 'date_update'],
];
}
public function rules()
{
[['user_id'], 'integer'],
[['name','desc'], 'string', 'max' => 70],
[['date_create', 'date_update'], 'date', 'format' => 'php:Y-m-d H:i:s'],
];
}
}
and you can use this way anywhere
public function actionIndex() {
$model = new MyModel;
$model->scenario = MyModel::SCENARIO_CREATE;
if ($model->load(\Yii::$app->request->post())){
if($model->save()){
// some operations
}
}
}

Answer 3

You could if you extend the rule with when for server validation:
[
['in_quantity'],
'required',
'when' => function ($model) {
return $model->scenario === 'stockIn' || $model->scenario === 'stockOut';
}
]
Also if you want to validate in the form (aka client side validation) you could also use the whenClient that expect a js function:
'whenClient' => "function (attribute, value) {
const scenario = $('#stock-scenario').val()
return scenario === 'stockIn' || scenario = 'stockOut';
}"