Cakephp retrieving row data from a table - cakephp

Question

I'm attempting to insert data from a row in one table into another following a button click. I have a table containing class information. When the user clicks register, I need to take the id of that class and insert it into my timetable table.
So far I'm trying to obtain the id from the POST data. However, when I run the debugger, the id for the class in the array is empty.
My register function:
public function register(){
$classestimetable = $this->Classestimetable->newEntity();
if ($this->request->is('post')) {
$classestimetable->user_id = $this->Auth->user('id');
$classestimetable->unit_id = $this->request->getData(['id']);
debug($classestimetable);exit;
if ($this->Classestimetable->save($classestimetable)) {
$this->Flash->success(__('The class has been added to your schedule.'));
return $this->redirect(['action' => 'index']);
}
$this->Flash->error(__('The class could not be added. Please, try again.'));
}
}
Table code:
<tbody>
<?php foreach ($units as $unit): ?>
<tr>
<td hidden><?= h($unit->id) ?></td>
<td><?= h($unit->className) ?></td>
<td><?= h($unit->user->firstName), ' ', h($unit->user->lastName) ?></td>
<td><?= h($unit->classDate) ?></td>
<td><?= h($unit->classTime) ?></td>
<td class="actions">
<?= $this->Form->postLink(__('Register'), ['action' => 'register', $unit->id], ['confirm' => __('Are you sure you want to register for "{0}"?', $unit->className)]) ?>
</td>
</tr>
<?php endforeach; ?>
</tbody>
Debug output:
object(App\Model\Entity\Classestimetable) {
'user_id' => (int) 11,
'unit_id' => null,
'[new]' => true,
'[accessible]' => [
'unit_id' => true,
'user_id' => true,
'unit' => true,
'user' => true
],
'[dirty]' => [
'user_id' => true,
'unit_id' => true
],
'[original]' => [],
'[virtual]' => [],
'[hasErrors]' => false,
'[errors]' => [],
'[invalid]' => [],
'[repository]' => 'Classestimetable'
}
When working I'm hoping the unit_id field will contain the id of the class the user has chosen to register for.

Answer 1

You are using $this->request->getData(['id']) to get the id. But in the URL you're building, you haven't named that parameter. Either change to:
['action' => 'register', 'id' => $unit->id]
or else change the definition of your function to:
public function register($id)
and then use $classestimetable->unit_id = $id;