I got it! Answer by myself....
1. config the routes.php
add $Route->connect('/*/add/*', array('controller' => 'users',
'action'=> 'add'));
2. add new function in the users_controller.php
function add($username)
{
$user = $this->User->findByUsername($username);
$this->set('user', $user);
if (!empty($this->data))
{
$this->data['Topic']['username']=$username;
$this->User->Topic->save($this->data);
{
$this->_message('Topic saved.', '/'.$user['User']['username'].'/');
}
}
//check the manul abou the Association-Saving models.
3.config the views/users/add.thtml
<form action="<?php echo
$html->url('/'.$user['User']['username'].'/add'); ?>" method="post">
<div class="optional">
<?php echo $form->labelTag('Topic/name', 'Name');?>
<?php echo $html->input('Topic/name', array('size' => '60'));?>
<?php echo $html->hidden('Topic/user_id', array('size' =>
'60','value'=>$user['User']['id']));?>
<?php echo $html->tagErrorMsg('Topic/name', 'Please enter the
Name.');?>
</div>
<div class="submit">
<?php echo $html->submit('Add');?>
</div>
</form>
P.S.
To clear abou the Model User and Topic
<?php pr($user)?>
To know the relation and the whole structure.
Loving Cake!!
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