php - How to assign validations for model and controller in cakephp? -

i developing 1 register form.but dont know how validations in cakephp register form in controller class.

model class:

user.php

<?php class user extends appmodel { var $name='user'; //var $usetable = false; var $validate= array(         'username'=>array(                 'rule'=>'notempty',                 'required'=>true,                 'message'=>'enter name'         ),         'email'=>array(                 'email'=>array(                         'rule'=>'email',                         'message'=>'enter valid emial address'                 ),                 'email'=>array(                         'rule'=>'notempty',                         'required'=>true,                         'message'=>'enter email address'                 )          ),          'password'=>array(                 'alphanumeric' => array(                         'rule' => 'alphanumeric',                         'required' => true,                         'message' => 'alphabets , numbers only'                 ),                 'password' => array(                         'rule' => array('minlength', '8'),                         'message' => 'minimum 8 characters long'                 ),                ),         'firstname'=>array(                 'rule'=>'notempty',                 'required'=>true,                 'message'=>'enter firstname'         ),         'lastname'=>array(                 'rule'=>'notempty',                 'required'=>true,                 'message'=>'enter lastname'         ), ); 

**controller class:

usercontroller.php**

<?php class userscontroller extends appcontroller {     var $name = 'users';          function send(){         if(!empty($this->data)){             $this->user->set($this->data);             if($this->user->validates()){                 if(!empty($this->data['user']['username'])) {                     $this->username->from = $this->data['user']['username'] ;                 }                 else{                     $this->username->from = $this->data['user']['username'] .                     ' <' . $this->data['user']['username'] . '>';                     $this->render('success');                 }             }             else {                 $this->render('register');             }         }     }     } 

users.register view *register.ctp*

<h3>registration form<h3>     <form action="../users/register" method="post" name="form">     username:<input type="text" name="username">     password:<input type="password" name="password">     email:<input type="text" name="email">     firstname:<input type="text" name="firstname">     lastname:<input type="text" name="lastname">     <input type="submit" value="register">     </form> 

please me how validations in cakephp.

create action named register() , created view register.ctp. register aciton code looks that-

function register(){     if(!empty($this->data)){         $this->user->create();         if($this->user->save($this->data)){                  $this->session->setflash("user saved!");                 $this->redirect('/login');             }             else{                  $this->session->setflash("unable save now, try later!");             }         }  } 

now when try save data, data validate automatically if define validate rules on model.