hasMany through Join Model not saving to database - cakephp

Question

When a user enters data into my form it isn't saving to the database, this is the structure of my tables
Invoice - id, sender_id, receiver_id, template_id
Field - id, name, description, default_value, template_id
fields_invoices - id, invoice_id, field_id, entered_value
here is the invoice model
class Invoice extends AppModel{
var $name='Invoice';
var $hasMany = array(
'FieldsInvoice');
here is the field model
var $hasMany = array(
'FieldsInvoice'
);
and here is the fieldsInvoice model
<?php
class FieldsInvoice extends AppModel {
public $belongsTo = array(
'Field' => array(
'className' => 'Field',
'foreignKey' => 'field_id',
'conditions' => '',
'fields' => '',
'order' => ''
),
'Invoice' => array(
'className' => 'Invoice',
'foreignKey' => 'invoice_id',
'conditions' => '',
'fields' => '',
'order' => ''
)
);
}
here is the create function in the invoices controller
public function create($id)
{
$this->set('title_for_layout', 'Create Invoice');
$this->set('stylesheet_used', 'homestyle');
$this->set('image_used', 'eBOXLogoHome.png');
$this->layout='home_layout';
if (!is_numeric($id)) throw new BadMethodCallException('I need an ID');
$this->Invoice->id = $id;
if (!$this->Invoice->exists()) throw new NotFoundException('Invalid ID');
$this->set('invoice_id',$id);
$names = $this->Invoice->find('list',array(
'fields'=>array('template_id'),
'conditions'=>array('id'=>$id)));
$fields = $this->Field->find('all', array(
'conditions'=>array(
'template_id'=>$names)));
$this->set(compact('fields'));
$this->set(compact('invoice_id'));
$this->set('name',$names);
$this->Invoice->create();
if(empty($this->data)){
$this->data= $this->Field->read($id);
}
else{
if($this->request->is('post'))
{
$this->Invoice->create();
if($this->FieldsInvoice->save($this->request->data, array('deep'=>true)));
{
$this->Session->setFlash('The field has been updated');
$this->redirect(array('controller'=>'invoices', 'action'=>'index'));
}
//else{
$this->Session->setFlash('Could not be saved');
//}
}
}
}
here is the view for the create function
<?php echo $this->Form->create('FieldsInvoice'); ?>
<?php foreach ($fields as $field): ?>
<?php echo $this->Form->hidden('Invoice.id'); ?>
<?php echo $this->Form->hidden($field['Field']['id']); ?>
<?php echo $this->Form->Input($field['Field']['name'], array('default' =>$field['Field']['default_value'])); ?>
<?php endforeach ;?>
<?php echo $this->Form->End('Submit');?>
when debugging the view this is the output received
array(
'Invoice' => array(
'id' => ''
),
'FieldsInvoice' => array(
(int) 5 => '',
'amount' => 'test',
(int) 6 => '',
'description' => 'test1',
(int) 7 => '',
'totalacctowing' => 'test2',
(int) 8 => '',
'pmtinfo' => 'test3'
)
)

Answer 1

Instead of:
$this->Invoice->save($this->request->data);
in your if condition use the following syntax;
$this->Invoice->save($this->request->data, array('deep' => true));
This link will guide you to save associated data.

Answer 2

Have you tried debugging? Try viewing your form data and see if all fields are ok. Use debug() or pr().