Cakephp: BelongsTo Relationship - cakephp

Question

I want to model the following simple relationship:
One Passenger belongs to a Car; One Car has many Passengers.
The passenger table has an id and Car_id column, the Car table has one id column.
My models look like this:
<?php
class Passenger extends AppModel {
var $name = 'Passenger';
var $belongsTo = 'Car';
} ?>
and
<?php
class Car extends AppModel {
var $name = 'Car';
var $hasMany = array (
'Passenger' => array (
'className' => 'Passenger',
'foreignKey' => 'car_id'
)
);
}
?>
and my add Passenger .ctp looks like this:
<?php
echo $this->Form->create('Passenger');
echo $this->Form->input('car_id');
echo $this->Form->end('Save');
?>
BUt when I access the page to add a passenger, all I see is an empty drop down box. Is there an additional step I must take in order to populate the dropbox with all cars?

Answer 1

First off, you have forgotten to mention the belongsTo relation in your Passenger model:
<?php
class Passenger extends AppModel {
var $name = 'Passenger';
var $belongsTo = array('Car');
}
?>
Next, in the corresponding action of your controller, you will need to obtain a list of all the cars from the database, and set it to the plural form of the model's variable ($cars). You would do that like so:
$cars = $this->Passenger->Car->find('list');
$this->set(compact('cars'));
This will convert the car_id input field into a drop down list with the populated information.
HTH.

Answer 2

The Passenger will only know about the car with which it is associated - at this point, none.
In the add method in the passenger controller, do
$this->Car->find('list');
and pass the result into your view:
$this->set('cars',$cars);
In the view, give the $cars variable as the value for $options in the field declaration:
echo $this->Form->input('car_id', array('options' => $cars));
Alternatively, you can do something like:
echo $this->Form->input('Car.id', array('options' => $cars));

Answer 3

$this->CompanyCashback->bindModel(array('belongsTo' => array(
'CompanyBranch' => array('className' => 'CompanyBranch', 'foreignKey' => false, 'conditions' => array('CompanyCashback.publisher_id = CompanyBranch.publisher_id && CompanyBranch.branch_type = "online" ')),
'PersonalInformation' => array('className' => 'PersonalInformation', 'foreignKey' => false, 'conditions' => array('CompanyCashback.publisher_id = PersonalInformation.user_id')),
'Country' => array('className' => 'Country', 'foreignKey' => false, 'conditions' => array('PersonalInformation.country_id = Country.id')),
'User' => array('className' => 'User', 'foreignKey' => false, 'conditions' => array('PersonalInformation.user_id = User.id')))
));