Yii user and rights extension

Hi to all respected members.

I am using yii user and rights extension in my project. The problem is when I register I can add a digit in my firstname and lastname, I see my database at localhost/phpmyadmin, The datatype of firstname and lastname in profiles table is VARCHAR(50), I want to change it to CHAR(50). I dont know how to do this as extension is doing this. So what should i do ? This is my profile model


<?php


class Profile extends UActiveRecord

{

	/**

	 * The followings are the available columns in table 'profiles':

	 * @var integer $user_id

	 * @var boolean $regMode

	 */

	public $regMode = false;

	

	private $_model;

	private $_modelReg;

	private $_rules = array();


	/**

	 * Returns the static model of the specified AR class.

	 * @return CActiveRecord the static model class

	 */

	public static function model($className=__CLASS__)

	{

		return parent::model($className);

	}


	/**

	 * @return string the associated database table name

	 */

	public function tableName()

	{

		return Yii::app()->getModule('user')->tableProfiles;

	}


	/**

	 * @return array validation rules for model attributes.

	 */

	public function rules()

	{

		if (!$this->_rules) {

			$required = array();

			$numerical = array();

			$float = array();		

			$decimal = array();

			$rules = array();

			

			$model=$this->getFields();

			

			foreach ($model as $field) {

				$field_rule = array();

				if ($field->required==ProfileField::REQUIRED_YES_NOT_SHOW_REG||$field->required==ProfileField::REQUIRED_YES_SHOW_REG)

					array_push($required,$field->varname);

				if ($field->field_type=='FLOAT')

					array_push($float,$field->varname);

				if ($field->field_type=='DECIMAL')

					array_push($decimal,$field->varname);

				if ($field->field_type=='INTEGER')

					array_push($numerical,$field->varname);

				if ($field->field_type=='VARCHAR'||$field->field_type=='TEXT') {

					$field_rule = array($field->varname, 'length', 'max'=>$field->field_size, 'min' => $field->field_size_min);

					if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

					array_push($rules,$field_rule);

				}

                               

				if ($field->other_validator) {

					if (strpos($field->other_validator,'{')===0) {

						$validator = (array)CJavaScript::jsonDecode($field->other_validator);

						foreach ($validator as $name=>$val) {

							$field_rule = array($field->varname, $name);

							$field_rule = array_merge($field_rule,(array)$validator[$name]);

							if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

							array_push($rules,$field_rule);

						}

					} else {

						$field_rule = array($field->varname, $field->other_validator);

						if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

						array_push($rules,$field_rule);

					}

				} elseif ($field->field_type=='DATE') {

					$field_rule = array($field->varname, 'type', 'type' => 'date', 'dateFormat' => 'yyyy-mm-dd', 'allowEmpty'=>true);

					if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

					array_push($rules,$field_rule);

				}

				if ($field->match) {

					$field_rule = array($field->varname, 'match', 'pattern' => $field->match);

					if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

					array_push($rules,$field_rule);

				}

				if ($field->range) {

					$field_rule = array($field->varname, 'in', 'range' => self::rangeRules($field->range));

					if ($field->error_message) $field_rule['message'] = UserModule::t($field->error_message);

					array_push($rules,$field_rule);

				}

			}

			

			array_push($rules,array(implode(',',$required), 'required'));

			array_push($rules,array(implode(',',$numerical), 'numerical', 'integerOnly'=>true));

			array_push($rules,array(implode(',',$float), 'type', 'type'=>'float'));

			array_push($rules,array(implode(',',$decimal), 'match', 'pattern' => '/^\s*[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?\s*$/'));

			array_push($rules,array('picture', 'file','types'=>'jpg, gif, png', 'allowEmpty'=>true, 'on'=>'update'));

                        $this->_rules = $rules;

		}

		return $this->_rules;

	}


	/**

	 * @return array relational rules.

	 */

	public function relations()

	{

		// NOTE: you may need to adjust the relation name and the related

		// class name for the relations automatically generated below.

		$relations = array(

			'user'=>array(self::HAS_ONE, 'User', 'id'),

		);

		if (isset(Yii::app()->getModule('user')->profileRelations)) $relations = array_merge($relations,Yii::app()->getModule('user')->profileRelations);

		return $relations;

	}


	/**

	 * @return array customized attribute labels (name=>label)

	 */

	public function attributeLabels()

	{

		$labels = array(

			'user_id' => UserModule::t('User ID'),

		);

		$model=$this->getFields();

		

		foreach ($model as $field)

			$labels[$field->varname] = ((Yii::app()->getModule('user')->fieldsMessage)?UserModule::t($field->title,array(),Yii::app()->getModule('user')->fieldsMessage):UserModule::t($field->title));

			

		return $labels;

	}

	

	private function rangeRules($str) {

		$rules = explode(';',$str);

		for ($i=0;$i<count($rules);$i++)

			$rules[$i] = current(explode("==",$rules[$i]));

		return $rules;

	}

	

	static public function range($str,$fieldValue=NULL) {

		$rules = explode(';',$str);

		$array = array();

		for ($i=0;$i<count($rules);$i++) {

			$item = explode("==",$rules[$i]);

			if (isset($item[0])) $array[$item[0]] = ((isset($item[1]))?$item[1]:$item[0]);

		}

		if (isset($fieldValue)) 

			if (isset($array[$fieldValue])) return $array[$fieldValue]; else return '';

		else

			return $array;

	}

	

	public function widgetAttributes() {

		$data = array();

		$model=$this->getFields();

		

		foreach ($model as $field) {

			if ($field->widget) $data[$field->varname]=$field->widget;

		}

		return $data;

	}

	

	public function widgetParams($fieldName) {

		$data = array();

		$model=$this->getFields();

		

		foreach ($model as $field) {

			if ($field->widget) $data[$field->varname]=$field->widgetparams;

		}

		return $data[$fieldName];

	}

	

	public function getFields() {

		if ($this->regMode) {

			if (!$this->_modelReg)

				$this->_modelReg=ProfileField::model()->forRegistration()->findAll();

			return $this->_modelReg;

		} else {

			if (!$this->_model)

				$this->_model=ProfileField::model()->forOwner()->findAll();

			return $this->_model;

		}

	}

}