Cakephp: pass parameter or data to another page - cakephp

Question

Our group create a database for patron to attend an event (booking) which has lots of entities.
We have three tables: patron, booking, booking_patron (join table).
We want to create 2 pages in the view (add.ctp and add2.ctp) of booking_patron.
Page add.ctp has a drop down box which lists booking ID and a submit button.
Page add2.ctp should appear the booking ID that we chose before (in add.ctp). Also in add2.ctp, we did make a function that user can create a patron and assign that patron to the booking ID.
BookingsPatronsController.php
public function add() {
$bookings = $this->BookingsPatron->Booking->find('list');
$this->set(compact('bookings', 'patrons'));
}
public function add2($booking_id = null) {
$patrons = $this->BookingsPatron->Patron->find('list');
$bookings = $this->BookingsPatron->Booking->find('list');
$this->set(compact('bookings', 'patrons'));
if ($this->request->is('post')) {
$this->BookingsPatron->Patron->create();
if ($this->BookingsPatron->Patron->save($this->request->data)) {
$this->Session->setFlash("Sign In Successful");
$this->BookingsPatron->create();
$this->Session->setFlash(__('Well.... done'));
$this->redirect(array('action' => 'add3'));
} else {
$this->Session->setFlash(__('We can not add your information. Please, try again.'));
}
}
}
The problem is: we don't know how to get the booking ID from add.ctp to add2.ctp.
At the moment, we use a drop down box that list booking ID in add2.ctp to choose the booking; we want to change that to a static text field that appears the booking ID from add.ctp.
We also have a function that can create a new patron in add2.ctp. We want to assign the new patron to the chosen booking ID from add.ctp
add.ctp
<?php echo $this->Form->input('Booking.booking_id');?>
<?php echo $this->Html->link(__('Create'), array('action' => 'add3')); ?>
add2.ctp
<?php echo $this->Form->create('BookingsPatron'); ?>
<fieldset>
<?php echo $this->Form->input('Booking.booking_id');?>
<table cellpadding="3" cellspacing="3">
<tr>
<td class="heading">Name: </td>
<td><?php echo $this->Form->input('Patron.patrons_name', array('label' => '', 'div' => 'formLabel'));?></td>
<td></td><td></td>
<td class="heading">E-mail: </td>
<td><?php echo $this->Form->input('Patron.patrons_email', array('label' => '', 'div' => 'formLabel'));?></td>
</tr>
<tr>
<td class="heading">Age: </td>
<td><?php echo $this->Form->input('Patron.patrons_age', array('label' => '', 'div' => 'formLabel'));?></td>
<td></td><td></td>
<td class="heading">Company: </td>
<td><?php echo $this->Form->input('Patron.patrons_company', array('label' => '', 'div' => 'formLabel'));?></td>
</tr>
<tr>
<td class="heading">Postcode: </td>
<td><?php echo $this->Form->input('Patron.patrons_postcode', array('label' => '', 'div' => 'formLabel'));?></td>
<td></td><td></td>
<td class="heading">Gender: </td>
<td><?php echo $this->Form->input('Patron.patrons_gender', array('label' => '', 'div' => 'formLabel', 'type' => 'select', 'options' => array('Male' => 'Male', 'Female' => 'Female')));?></td>
</tr>
<tr>
<td colspan="2">PH: 1300 7 34726</td>
<td colspan="3"></td>
<td><?php echo $this->Form->submit('Submit', array('class' => 'classSubmitButton', 'title' => 'Sbumit')); ?></td>
</tr>
</table>
</fieldset>

Answer 1

This should work
public function add() {
if ($this->request->is('post')) {
$this->Session->write('booking_id', $this->request->data['Booking']['booking_id']);
$this->redirect(array('action' => 'add2')); // Line added
}
$bookings = $this->BookingsPatron->Booking->find('list');
$this->set(compact('bookings', 'patrons'));
}
And to retreive the ID use this in your add2() function
$booking_id = $this->Session->read('booking_id');
Update
edit add.ctp -- This needs to be a form, not just a link, otherwise you don't submit the booking ID
<?php
echo $this->Form->create('Booking');
echo $this->Form->input('Booking.booking_id');
echo $this->Form->end(__('Create'));
?>