How to apply rules on update in yii2 - yii

Question

I am new to yii2 and I don't exactly know how to apply same rules of insert into update. Here is my rules for insert and I want all rules to effect on update too.
public $tag;
public function rules()
{
return [
[['user_id', 'name', 'address', 'state'], 'required'],
[['user_id'], 'integer'],
[['tag'], 'safe'],
[['name'], 'string', 'max' => 30],
[['address'], 'string', 'max' => 250],
[['state'], 'string', 'max' => 255],
];
}
Adding 'on' => 'update' doesn't effect in my code. Sorry for my english. Thanks.

Answer 1

The default rules are applied in the creation and update, you only have to create new rules if you want different behaviors between update and create.
To apply the rules just make a $model->validate() to check the rules, see this example of the documentation of yii2
$model->load(\Yii::$app->request->post());
if ($model->validate()) {
// all inputs are valid
} else {
// validation failed: $errors is an array containing error messages
$errors = $model->errors;
}

Answer 2

You can add validation rules to yii model like this
public function rules(){
return [
[['boolean_var'],'boolean'],
[[ 'range_in_string'],'required'],
[['default_value'],'default','value'=>'DEFAULT VALUE'],
[['integer_var'],'integer'],
[['double_var'],'double'],
[['number_min'],'number','min'=>10],
[['number_max'],'number','max'=>100],
[['number_min_max'],'number','min'=>10,'max'=>100],
[['file_image'],'image'],
[['file_var'],'file','types'=>['gif','jpg']],
[['date_var'],'date', 'format'=>'d-m-yy'],
[['min_string'],'string','min'=>10],
[['max_string'],'string','max'=>10],
[['min_max_string'],'string','min'=>5,'max'=>10],
['min_max_string2', 'string', 'length' => [4, 10]],
['email_var','email'],
['url_var','url'],
[['unique_var'],'unique'],
[['filter_trim'],'filter','filter'=>'trim'],
[['filter_trim'],'filter','filter'=>'strtolower'],
['filter_custom_function', 'filter', 'filter' => function ($value) {
// your concept
if($value=='')
return '';
return 'Value Changed';}],
['range_in_min_max', 'in','range'=>range(5,20)],
['range_in','in','range'=>['en','fr','zn'],'strict'=>false], //strict false
['range_in_string','in','range'=>['EN','FR','ZN'],'strict'=>true],
['custom_validation','custom_function_validation'],
[['passwordConfirm'], 'compare', 'compareAttribute' => 'password'],
[['password','date_var'],'safe'],
];
}
if you need to trigger only when updating but not creating, you can add a scenario like this
public function rules()
{
return [
// username, email and password are all required in "update" scenario
[['username', 'email', 'password'], 'required', 'on' => 'update'],
// username and password are required in "login" scenario
[['username', 'password'], 'required', 'on' => 'login'],
];
}
and in your action before calling validate add the scenario
// scenario is set as a property
$model = new User;
$model->scenario = 'update';