Creating objects from the parent object of a hasmany relationship in a controller

[Sam Marland]

I am creating a web application that stores user's journeys and I'm build 
this application in CakePHP 2.2.5.

I have a Journey model and that journey model has many coordinate objects 
which store the lat long coordinates.

I want to create a REST API to create journeys that accepts JSON in the 
body which will contain information detailing the journey as well as 
detailing coordinates, to create the coordinates objects that should be 
attached to the journey object all in one controller method. 

I'm not sure where to start.

Here is the code for the add function in the journeys controller

public function add() {
    if ($this->request->is('post')) {
        $this->Journey->create();
        if ($this->Journey->save($this->request->data)) {
            $this->Session->setFlash(__('The journey has been saved'));
            $this->redirect(array('action' => 'index'));
        } else {
            $this->Session->setFlash(__('The journey could not be saved. 
Please, try again.'));
        }
    }
    $users = $this->Journey->User->find('list');
    $this->set(compact('users'));}

Any help would be appreciated. 

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