Experimenting with password length validation within Kohana 3.2 ORM validation system

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<?php

class Model_User extends Model_Auth_User {

  protected $_raw_data;


  public function rules() {

    $rules = parent::rules();

    $rules[ 'username' ][] = array( 'regex', array( ':value', "/^[a-zA-Z][a-zA-Z0-9-]+$/D" ) );

    $rules[ 'username' ][] = array( 'max_length', array( ':value', 24 ) );

    if ( $this->changed( 'password' ) ) {

      $rules[ 'password' ][] = array( 'min_length', array( $this->_raw_data[ 'password' ], 8 ) );

    }
    // if


    return $rules;

  }
  // rules


  protected function run_filter( $field, $value ) {
    
    $this->_raw_data[ $field ] = $value;


    return parent::run_filter( $field, $value );

  }
  // run_filter

}
// Model_User