Updating a row in cakephp - cakephp

Question

I need to update a particular row. This doesn't seem to work. Any help is appreciated.
View updated:
<?php
echo $this->Form->create("Setting", array('action' => 'index'));
echo $this->Form->input('id', array('type' => 'hidden'));
echo $this->Form->checkbox('blog_state');
echo $this->Form->end('Save Post');
?>
Controller updated:
public function index($id = 0){
$this->Setting->id = $id;
if (empty($this->request->data)) {
$this->request->data = $this->Setting->read();
} else {
if ($this->request->is('post')) {
$this->request->data['Setting']['id'] = $id;
$this->Setting->save($this->request->data);
$this->Session->setFlash('This should have saved...');
}
}
}
Edit:
blog_state is a boolean, and works fine. It loads the value from the DB normally and saves it to the new row normally. (I need it to update the existing row it is being pulled from, which is where my problem is)

Answer 1

Update your view:
<?php
echo $this->Form->create("Setting", array('action' => 'index'));
echo $this->Form->input('id', array('type' => 'hidden'));
echo $this->Form->checkbox('blog_state');
echo $this->Form->end('Save Page');
?>
You will also need to make sure you set the id in the function so it will populate the value correctly. The record cannot be updated unless it knows the PK ID it is updating.
The way you can accomplish this is by setting it in the request data:
$this->request->data['Setting']['id'] = $id;
Then it will automatically be set in the view.
UPDATE
It looks like your logic may be flawed. The form will not necessarily pass the ID back on the URL. So update you form like so and check again if it works. It looks like the way you currently have it it will set ID to null which will create a new record.
public function index($id = 0){
if (empty($this->request->data)) {
$this->Setting->id = $id;
$this->request->data = $this->Setting->read();
} else {
if ($this->request->is('post')) {
$this->Setting->save($this->request->data);
$this->Session->setFlash('This should have saved...');
}
}
}

Answer 2

Well you need to know what row it is effecting (this will usually be argument to your function).
public function index() {
// Things here
}
This will create the index page for that controller.
Create an edit function like
public function edit($id = null) {
$this->Setting->id = $id;
if (!$this->Setting->exists()) {
// Exception.
}
if ($this->Setting->save($this->request->data)) {
$this->Session->setFlash(__('Saved'));
}
}
Then you can access it like http://example.com/setting/edit/45

Answer 3

Make sure you have primary key id column in your DB if not override the your chosen primary key in model like below.
<?php
class Test extends AppModel{
public $primaryKey = 'primarykey column name';
}
?>