cakephp passing a parameter after the form

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im creating a page that when a user adds a message to the database they are taken back to their view messages page(shows a list of related messages on page). However when I click submit to add a message it doesn't pass the parameter too the url.

 public function add_admin($id=null){
    //allows user to add a new message to a dispute
    $this->set('title_for_layout', 'Dispute Information');
    $this->set('stylesheet_used', 'homestyle');
    $this->set('image_used', 'eBOXLogoHome.png');
    $this->layout='home_layout';
    //gets messages where Message.dispute_id=$id
    $dispute=$this->Message->field('dispute_id', array('dispute_id'=>$id));
    //sets the variables

    $this->set('dispute', $dispute);
    //$sets the variable $user to User.id
    $user=$this->Auth->User('id');
    //sets the variable
    $this->set('user',$user);
    //if the request posts to the database
    if($this->request->is('post')){
    //create an instance of message in the database
        $this->Message->create();
    //if the message saves
    if ($this->Message->save($this->request->data)) {
    //redirect the user to Messages/viewMessage_admin
        $this->redirect( array('controller' => 'Messages','action' => 'viewMessage_admin',$id));

    }
    }

    $this->set('id',$id);

    }


public function viewMessage_admin($id=null){
//allows users to view all messages related to a dispute
$this->set('title_for_layout', 'Dispute Information');
$this->set('stylesheet_used', 'homestyle');
$this->set('image_used', 'eBOXLogoHome.png');
$this->layout='home_layout';
$this->set('dispute_id',$id);
debug($id);
//find all messages where Message.dispute_id=$id
$Messages=$this->Message->find('all',array(
'conditions'=>array('dispute_id'=>$id)));
//find User details where user.id=message.user_id
$Username=$this->User->find('all', array(
'conditions'=>array(
'User.id'=>'Message.user_id')));
//get messages where message.dispute_id=$id
$dispute=$this->Message->field('dispute_id', array('dispute_id'=>$id));
//sets the variables
$this->set('dispute', $dispute);
$this->set('username', $Username);
$this->set('dispute_id',$id);
$this->set('message',$Messages);

}

here is the code for my form

<table id="data">
<tr>
<th>Please add your message below.</th></tr>
<tr><td>
<?php echo  $this->Form->create('Message', array('action'=>'add_admin')); ?>
<?php echo $this->Form->inpute('user_id', array('type'=>'hidden', 'value'=>$user)); ?>
<?php echo $this->Form->input('message',array('label'=>false)); ?>
</td></tr><tr><td>
<?php echo $this->Form->hidden( 'dispute_id', array( 'value' => $dispute ) ); ?>
<?php echo $this->Form->end('Submit'); ?></td></tr>
</table>


Shouldn't you be doing this?

if ($this->Message->save($this->request->data)) {
    $this->redirect( array('controller' => 'Messages','action' => 'viewMessage_admin', $this->Message->id ));

}

It seems as though you want to redirect them to the saved message, so try using $this->Message->id instead.

UPDATE

<?php echo  $this->Form->create('Message', array('url'=>'/messages/add_admin/' . $id )); ?>