magento — фатальная ошибка: вызов функции-члена getPdf () для необъекта в контроллерах \ Mage \ Adminhtml \ Sales \ OrderController.Stack Overflow

Я получаю следующую ошибку в модуле, разрабатываемом для печати пользовательского счета / PDF. Код работает до части контроллера, но когда он пытается вызвать модель, там происходит ошибка.

Я не собираюсь перезаписывать базовую модель, поскольку предполагается, что старый счет-фактура должен работать как есть, а новый отпечаток заказа склада массовых действий должен генерировать новый тип PDF.
Пожалуйста, помогите со следующим кодом, я застрял без подсказки!

Fatal error: Call to a member function getPdf() on a non-object in C:\wamp\www\Goku\app\code\local\Goku\Ordersexporter\controllers\Mage\Adminhtml\Sales\OrderController.php on line 332

Структура модуля

app-
|-code
|-local
|-Goku
|-Ordersexporter
|-Block
|   |-Mage
|       |-Adminhtml
|           |-Sales
|               |-Order
|                   |-Grid.php
|-controllers
|   |-Mage
|       |-Adminhtml
|           |-Sales
|               |-OrderController.php
|-etc
|   |-config.xml
|-Model
|-Order
|-Pdf
|-Invoice.php

1) grid.php

class Goku_Ordersexporter_Block_Mage_Adminhtml_Sales_Order_Grid extends Mage_Adminhtml_Block_Sales_Order_Grid
{
public function __construct()
{
parent::__construct();
}

protected function _prepareMassaction()
{

$this->getMassactionBlock()->addItem('Goku_warehouseOrderPrint', array(
'label' => Mage::helper('sales')->__('Warehouse Order Sheet'),
'url' => $this->getUrl('*/sales_order/Goku_warehouseOrderPrint'),
));

parent::_prepareMassaction();
return $this;
}
}

2) OrderController.php

$defController = Mage::getBaseDir()
. DS . 'app' . DS . 'code' . DS . 'core'
. DS . 'Mage' . DS . 'Adminhtml' . DS . 'controllers'
. DS . 'Sales' . DS . 'OrderController.php';

require_once $defController;

class Goku_Ordersexporter_Mage_Adminhtml_Sales_OrderController extends Mage_Adminhtml_Sales_OrderController
{
public function Goku_warehouseOrderPrintAction()
{
$orderIds = $this->getRequest()->getPost('order_ids');
$flag = false;
if (!empty($orderIds)) {
foreach ($orderIds as $orderId) {
$invoices = Mage::getResourceModel('sales/order_invoice_collection')
->setOrderFilter($orderId)
->load();
if ($invoices->getSize() > 0) {
$flag = true;
if (!isset($pdf)) {
$pdf = Mage::getModel('Goku_Ordersexporter/order_pdf_invoice')->getPdf($invoices);
} else {
$pages = Mage::getModel('Goku_Ordersexporter/order_pdf_invoice')->getPdf($invoices);
$pdf->pages = array_merge($pdf->pages, $pages->pages);
}
}
}
if ($flag) {
return $this->_prepareDownloadResponse(
'invoice' . Mage::getSingleton('core/date')->date('Y-m-d_H-i-s') . '.pdf', $pdf->render(),
'application/pdf'
);
} else {
$this->_getSession()->addError($this->__('There are no printable documents related to selected orders.'));
$this->_redirect('*/*/');
}
}
$this->_redirect('*/*/');
}
}

3) config.xml

<?xml version="1.0"?>
<config>
<modules>
<Goku_Ordersexporter>
<version>1.0.0.0</version>
</Goku_Ordersexporter>
</modules>

<global>
<blocks>
<adminhtml>
<rewrite>
<sales_order_grid>Goku_Ordersexporter_Block_Mage_Adminhtml_Sales_Order_Grid</sales_order_grid>
</rewrite>
</adminhtml>
</blocks>
<models>
<Goku_Ordersexporter>
<class>Goku_Ordersexporter_Model</class>
</Goku_Ordersexporter>
</models>
</global>

<admin>
<routers>
<adminhtml>
<args>
<modules>
<Goku_Ordersexporter before="Mage_Adminhtml">Goku_Ordersexporter_Mage_Adminhtml</Goku_Ordersexporter>
</modules>
</args>
</adminhtml>
</routers>
</admin>

</config>

4) Invoice.php

class Goku_Ordersexporter_Mage_Sales_Model_Order_Pdf_Invoice extends Mage_Sales_Model_Order_Pdf_Invoice
{
public function getPdf($invoices = array())
{
$this->_beforeGetPdf();
$this->_initRenderer('invoice');

$pdf = new Zend_Pdf();
$this->_setPdf($pdf);
$style = new Zend_Pdf_Style();
$this->_setFontBold($style, 10);

foreach ($invoices as $invoice) {
if ($invoice->getStoreId()) {
Mage::app()->getLocale()->emulate($invoice->getStoreId());
Mage::app()->setCurrentStore($invoice->getStoreId());
}
$page  = $this->newPage();
$order = $invoice->getOrder();
/* Add image */
$this->insertLogo($page, $invoice->getStore());
/* Add address */
$this->insertAddress($page, $invoice->getStore());
/* Add head */
$this->insertOrder(
$page,
$order,
Mage::getStoreConfigFlag(self::XML_PATH_SALES_PDF_INVOICE_PUT_ORDER_ID, $order->getStoreId())
);
/* Add document text and number */
$this->insertDocumentNumber(
$page,
Mage::helper('sales')->__('Invoice # ') . $invoice->getIncrementId()
);
/* Add table */
$this->_drawHeader($page);
/* Add body */
foreach ($invoice->getAllItems() as $item){
if ($item->getOrderItem()->getParentItem()) {
continue;
}
/* Draw item */
$this->_drawItem($item, $page, $order);
$page = end($pdf->pages);
}
/* Add totals */
$this->insertTotals($page, $invoice);
if ($invoice->getStoreId()) {
Mage::app()->getLocale()->revert();
}
}
$this->_afterGetPdf();
return $pdf;
}

public function newPage(array $settings = array())
{
/* Add new table head */
$page = $this->_getPdf()->newPage(Zend_Pdf_Page::SIZE_A4);
$this->_getPdf()->pages[] = $page;
$this->y = 800;
if (!empty($settings['table_header'])) {
$this->_drawHeader($page);
}
return $page;
}
}