Yii2: ActiveForm field numeric, length => 8 - php

Question

I'm trying to make yii2 to validate my ActiveForm field that should be numeric and of 8 characters long.
Following is what I tried in the default LoginForm model of yii2/advanced/backend, but unfortunately the isNumeric validator simply doesn't kick in:
public function rules()
{
return [
// username and password are both required
[['username', 'password'], 'required'],
// username should be numeric
['username', 'isNumeric'],
// username should be numeric
['username', 'string', 'length'=>8],
// password is validated by validatePassword()
['password', 'validatePassword'],
];
}
/**
* Validates if the username is numeric.
* This method serves as the inline validation for username.
*
* #param string $attribute the attribute currently being validated
* #param array $params the additional name-value pairs given in the rule
*/
public function isNumeric($attribute, $params)
{
if (!is_numeric($this->username))
$this->addError($attribute, Yii::t('app', '{attribute} must be numeric', ['{attribute}'=>$attribute]));
}
/**
* Validates the password.
* This method serves as the inline validation for password.
*
* #param string $attribute the attribute currently being validated
* #param array $params the additional name-value pairs given in the rule
*/
public function validatePassword($attribute, $params)
{
if (!$this->hasErrors()) {
$user = $this->getUser();
if (!$user || !$user->validatePassword($this->password)) {
$this->addError($attribute, 'Incorrect username or password.');
}
}
}
I also tried adding a scenario as suggested in a related post (https://stackoverflow.com/a/27817221/2037924) but that only worked (as in displayed the error) if I did not include the password field in the scenario.
Is this a good way to achieve this at all, or can you think of a better way of doing it?
Note: the reason I define username as string is because the numbers may contain leading 0's.

Answer 1

Try with integer data type:
[['username'], 'integer'],
[['username'], 'string', 'min' => 8],
It will validate both numeric and length. This will do the trick.

Answer 2

Read more about the validations here: http://www.yiiframework.com/doc-2.0/guide-tutorial-core-validators.html#number
This works fine for me using the contact form from yii2-basic
/**
* #return array the validation rules.
*/
public function rules()
{
return [
// name, email, subject and body are required
[['name', 'email', 'subject', 'body'], 'required'],
// email has to be a valid email address
['email', 'email'],
['subject', 'is8NumbersOnly'],
// verifyCode needs to be entered correctly
['verifyCode', 'captcha'],
];
}
public function is8NumbersOnly($attribute)
{
if (!preg_match('/^[0-9]{8}$/', $this->$attribute)) {
$this->addError($attribute, 'must contain exactly 8 digits.');
}
}

Answer 3

public function rules()
{
return [
// username should be numeric
['username', 'match', 'pattern' => '/^\d{8}$/', 'message' => 'Field must contain exactly 8 digits.],
// ...
];
}

Answer 4

try this:
public function rules()
{
return [
// name, email, subject and body are required
[['name', 'email', 'subject', 'body'], 'required'],
// email has to be a valid email address
['email', 'email'],
[['subject'], 'number'],
[['subject'], 'string', 'max' => 8, 'min' => 8],
// verifyCode needs to be entered correctly
['verifyCode', 'captcha'],
];
}