如何添加自定义用户名和电子邮件可用方法作为kohana中的规则

Question

What is the correct format to add rules to check unique username and email in kohana 3.3

I have tried the followings

 array(array($this, 'unique'), array('username', ':value')); // added similar to email also
 array('username',array('unique_username'); // / added similar to email also
 array('username',array('unique_username',array(':value')); // / added similar to email also

public static function unique_username($username)
{
    echo 'running';

    // Check if the username already exists in the database
    return ! DB::select(array(DB::expr('COUNT(username)'), 'total'))
        ->from('users')
        ->where('username', '=', $username)
        ->execute()
        ->get('total');
}

I am getting the following error

Argument 3 passed to Kohana_Validation::rule() must be an array, string given

Answer 1

I can't give you an exact answer because you don't show your class name. For example, if your class was named Model_User here's how your would use a static method as a validation callback:

->rule('username', 'Model_User::unique_username', array(':value'));

or

->rule('username', array('Model_User', 'unique_username'), array(':value'));