MageMonkey Mandrill + WebShopApps PDF Invoicing : Attachments

Invoice.php

/**
 * Webshopapps_Invoicing
 * File: app/code/community/Webshopapps/Invoicing/Sales/Model/Order/Invoice.php
 *
 * Change addAttachment() function at the end of the file, to use this content
 */

    public function addAttachment($mailTemplate,$pdf, $filename) {
        $file=$pdf->render();
        $mailTemplate->getMail()->createAttachment(
            $file,
            'application/pdf',
            Zend_Mime::DISPOSITION_ATTACHMENT,
            Zend_Mime::ENCODING_BASE64,
            $filename
        );
    }

Order.php

/**
 * Webshopapps_Invoicing
 * File: app/code/community/Webshopapps/Invoicing/Sales/Model/Order.php
 *
 * Change addAttachment() function at the end of the file, to use this content
 */

    public function addAttachment($mailTemplate,$pdf, $filename) {
        $file=$pdf->render();
        $mailTemplate->getMail()->createAttachment(
            $file,
            'application/pdf',
            Zend_Mime::DISPOSITION_ATTACHMENT,
            Zend_Mime::ENCODING_BASE64,
            $filename
        );
    }

Template.php

/**
 * MageMonkey_Mandrill
 * File: app/code/community/Ebizmarts/Mandrill/Model/Email/Template.php
 *
 * Fillout this two functions:
 * https://github.com/ebizmarts/magemonkey/blob/master/app/code/community/Ebizmarts/Mandrill/Model/Email/Template.php#L157
 * https://github.com/ebizmarts/magemonkey/blob/master/app/code/community/Ebizmarts/Mandrill/Model/Email/Template.php#L165
 */
 
    public function createAttachment($body,
                                 $mimeType    = Zend_Mime::TYPE_OCTETSTREAM,
                                 $disposition = Zend_Mime::DISPOSITION_ATTACHMENT,
                                 $encoding    = Zend_Mime::ENCODING_BASE64,
                                 $filename    = null)
    {
        $mp = new Zend_Mime_Part($body);
        $mp->encoding = $encoding;
        $mp->type = $mimeType;
        $mp->disposition = $disposition;
        $mp->filename = $filename;
        
        $this->addAttachment($mp);
        
        return $mp;
    }
  
    public function addAttachment(Zend_Mime_Part $att)
    {
        $this->getMail()->addPart($att);
        $this->getMail()->hasAttachments = true;
        
        return $this->getMail();
    }