今天我将用短短的几步添加自定义属性到Magento的PDF发票。最近我有个任务是为产品创建一个名称为“alwayly_warehouse_location”的自定义属性，当点击“打印”（在后台发票区域）事件时输出它。由于发票打印是Magento核心功能，所以我们需要重写它。

第一步

在你的Magento项目中创建下面的文件：

• app/code/local/Alwayly/Invoice/Model/Order/Pdf/Items/Invoice/Default.php
• app/code/local/Alwayly/Invoice/Model/Order/Pdf/Invoice.php
• app/code/local/Alwayly/Invoice/etc/config.xml

这些是用来修改Magento核心功能的。

第二步

将下面代码加入到对应的文件中去： config.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Alwayly_Invoice>
            <version>0.1.0</version>
        </Alwayly_Invoice>
    </modules>
    <global>
        <models>
            <sales>
                <rewrite>
                    <order_pdf_invoice>Alwayly_Invoice_Model_Order_Pdf_Invoice</order_pdf_invoice>                <order_pdf_items_invoice_default>Alwayly_Invoice_Model_Order_Pdf_Items_Invoice_Default</order_pdf_items_invoice_default>
                </rewrite>
            </sales>
        </models>
    </global>
</config>

Default.php

<?php
/**
 * Alwayly PDF rewrite for custom attribute
 * Attribute "alwayly_warehouse_location" has to be set manually
 * Original: Sales Order Invoice Pdf default items renderer
 *
 * @category   Alwayly
 * @package    Inhoo_Invoice
 */
 
class Alwayly_Invoice_Model_Order_Pdf_Items_Invoice_Default extends Mage_Sales_Model_Order_Pdf_Items_Invoice_Default
{
    /**
     * Draw item line
	 **/
    public function draw()
    {
        $order  = $this->getOrder();
        $item   = $this->getItem();
        $pdf    = $this->getPdf();
        $page   = $this->getPage();
        $lines  = array();
 
		//Alwayly - Added custom attribute to PDF, first get it if exists
		$WarehouseLocation = $this->getWarehouseLocationValue($item);
 
        // draw Product name
        $lines[0] = array(array(
            'text' => Mage::helper('core/string')->str_split($item->getName(), 60, true, true),
            'feed' => 35,
        ));
 
		//Alwayly - Added custom attribute
		//draw Warehouse Location
        $lines[0][] = array(
            'text'  => Mage::helper('core/string')->str_split($WarehouseLocation, 25),
            'feed'  => 245
        );
 
        // draw SKU
        $lines[0][] = array(
            'text'  => Mage::helper('core/string')->str_split($this->getSku($item), 25),
            'feed'  => 325
        );
 
        // draw QTY
        $lines[0][] = array(
            'text'  => $item->getQty()*1,
            'feed'  => 435
        );
 
        // draw Price
        $lines[0][] = array(
            'text'  => $order->formatPriceTxt($item->getPrice()),
            'feed'  => 395,
            'font'  => 'bold',
            'align' => 'right'
        );
 
        // draw Tax
        $lines[0][] = array(
            'text'  => $order->formatPriceTxt($item->getTaxAmount()),
            'feed'  => 495,
            'font'  => 'bold',
            'align' => 'right'
        );
 
        // draw Subtotal
        $lines[0][] = array(
            'text'  => $order->formatPriceTxt($item->getRowTotal()),
            'feed'  => 565,
            'font'  => 'bold',
            'align' => 'right'
        );
 
        // custom options
        $options = $this->getItemOptions();
        if ($options) {
            foreach ($options as $option) {
                // draw options label
                $lines[][] = array(
                    'text' => Mage::helper('core/string')->str_split(strip_tags($option['label']), 70, true, true),
                    'font' => 'italic',
                    'feed' => 35
                );
 
                if ($option['value']) {
                    $_printValue = isset($option['print_value']) ? $option['print_value'] : strip_tags($option['value']);
                    $values = explode(', ', $_printValue);
                    foreach ($values as $value) {
                        $lines[][] = array(
                            'text' => Mage::helper('core/string')->str_split($value, 50, true, true),
                            'feed' => 40
                        );
                    }
                }
            }
        }
 
        $lineBlock = array(
            'lines'  => $lines,
            'height' => 10
        );
 
        $page = $pdf->drawLineBlocks($page, array($lineBlock), array('table_header' => true));
        $this->setPage($page);
 
    }
 
	/*
	 * Return Value of custom attribute
	 * */
	private function getWarehouseLocationValue($item)
	{
		$prod = Mage::getModel('catalog/product')->load($item->getProductId());
 
		if(!($return_location = $prod->getAlwaylyWarehouseLocation()))
			return 'N/A';
		else
			return $return_location;
	}
}

Invoice.php

<?php
/**
 * Alwayly PDF rewrite for custom attribute
 * * Attribute "alwayly_warehouse_location" has to be set manually
 * Original: Sales Order Invoice PDF model
 *
 * @category   Alwayly
 * @package    Alwayly_Invoice
 */
class Alwayly_Invoice_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());
            }
            $page = $pdf->newPage(Zend_Pdf_Page::SIZE_A4);
            $pdf->pages[] = $page;
 
            $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()));
 
            $page->setFillColor(new Zend_Pdf_Color_GrayScale(1));
            $this->_setFontRegular($page);
            $page->drawText(Mage::helper('sales')->__('Invoice # ') . $invoice->getIncrementId(), 35, 780, 'UTF-8');
 
            /* Add table */
            $page->setFillColor(new Zend_Pdf_Color_RGB(0.93, 0.92, 0.92));
            $page->setLineColor(new Zend_Pdf_Color_GrayScale(0.5));
            $page->setLineWidth(0.5);
 
            $page->drawRectangle(25, $this->y, 570, $this->y -15);
            $this->y -=10;
 
            /* Add table head */
            $page->setFillColor(new Zend_Pdf_Color_RGB(0.4, 0.4, 0.4));
            $page->drawText(Mage::helper('sales')->__('Products'), 35, $this->y, 'UTF-8');
			//Added for custom attribute "alwayly_warehouse_location"
            $page->drawText(Mage::helper('sales')->__('Warehouse Location'), 245, $this->y, 'UTF-8');
			$page->drawText(Mage::helper('sales')->__('SKU'), 325, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Price'), 380, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Qty'), 430, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Tax'), 480, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Subtotal'), 535, $this->y, 'UTF-8');
 
            $this->y -=15;
 
            $page->setFillColor(new Zend_Pdf_Color_GrayScale(0));
 
            /* Add body */
            foreach ($invoice->getAllItems() as $item){
                if ($item->getOrderItem()->getParentItem()) {
                    continue;
                }
 
                if ($this->y < 15) {
                    $page = $this->newPage(array('table_header' => true));
                }
 
                /* Draw item */
                $page = $this->_drawItem($item, $page, $order);
            }
 
            /* Add totals */
            $page = $this->insertTotals($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'])) {
            $this->_setFontRegular($page);
            $page->setFillColor(new Zend_Pdf_Color_RGB(0.93, 0.92, 0.92));
            $page->setLineColor(new Zend_Pdf_Color_GrayScale(0.5));
            $page->setLineWidth(0.5);
            $page->drawRectangle(25, $this->y, 570, $this->y-15);
            $this->y -=10;
 
            $page->setFillColor(new Zend_Pdf_Color_RGB(0.4, 0.4, 0.4));
            $page->drawText(Mage::helper('sales')->__('Product'), 35, $this->y, 'UTF-8');
			//Added for custom attribute "alwayly_warehouse_location"
			$page->drawText(Mage::helper('sales')->__('Warehouse Location'), 245, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('SKU'), 325, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Price'), 380, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Qty'), 430, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Tax'), 480, $this->y, 'UTF-8');
            $page->drawText(Mage::helper('sales')->__('Subtotal'), 535, $this->y, 'UTF-8');
 
            $page->setFillColor(new Zend_Pdf_Color_GrayScale(0));
            $this->y -=20;
        }
        return $page;
    }
}

第三步

进入后台 “Sales->Invoices->(View any of them)->Print”。下载PDF后可在每个订单物品中看到“Warehouse Location” 。

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