cmc-sales/app/models/invoice.php

<?php
class Invoice extends AppModel {

	var $name = 'Invoice';

       // var $recursive = 2;

	var $validate = array(
		'issue_date' => array('date'),
		'due_date' => array('date'),
		'title' => array('notempty'),
		'paid' => array('numeric'),
		'enquiry_id' => array('numeric'),
		'user_id' => array('numeric')
	);

	//The Associations below have been created with all possible keys, those that are not needed can be removed
	var $belongsTo = array(
		'Enquiry' => array(
			'className' => 'Enquiry',
			'foreignKey' => 'enquiry_id',
                        'counterCache'=> true
		),
                'Customer' => array(
                    'className' => 'Customer',
                    'foreignKey' => 'customer_id'
                ),
                'Job' => array(
                        'className' => 'Job',
                        'foreignKey' => 'job_id'
                ),
		'Currency' => array(
			'className' => 'Currency',
			'foreignKey' => 'currency_id'
		),
		'Document' => array(
			'className' => 'Document',
			'foreignKey' => 'document_id'
		)
	);


	    var $hasAndBelongsToMany = array(
	   
	    'Email' => array(
			    'className' => 'Email',
			    'joinTable' => 'emails_invoices',
	    )
    );

}
?>