根据产品属性判断前端是否开启购买

需求，有些产品仅做于展示，有些产品则可以加入销售，这个时候需要在后天产品管理里加一个属性来做判断是否开启购买。话不多说上步骤。

一 通过setup新建产品属性

app\code\CP\Lessohomeppw\Setup\UpgradeData.php

namespace CP\Lessohomeppw\Setup;

use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\UpgradeDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class UpgradeData implements UpgradeDataInterface
{
    private $eavSetupFactory;
    /**
    * Init
    *
    * @param EavSetupFactory $eavSetupFactory
    */
    public function __construct(EavSetupFactory $eavSetupFactory)
    {
        $this->eavSetupFactory = $eavSetupFactory;
    }
    /**
     * @param ModuleDataSetupInterface $setup
     * @param ModuleContextInterface $context
     */
    // @codingStandardsIgnoreStart     
    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context) 
    {
        /** @var EavSetup $eavSetup */
        $setup->startSetup();
        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
        /**
        * Add attributes is_newproduct to the eav/attribute
        */
            if (version_compare($context->getVersion(), '1.0.1') < 0) {
                $eavSetup->addAttribute(
                    \Magento\Catalog\Model\Product::ENTITY,
                    'pdp_add_cart',
                    [
                        'group' => 'General',
                        'type' => 'int',
                        'backend' => '',
                        'frontend' => '',
                        'label' => 'Product Add To Cart',
                        'input' => 'select',
                        'class' => '',
                        'source' => 'Magento\Eav\Model\Entity\Attribute\Source\Boolean',
                        'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
                        'visible' => true,
                        'required' => false,
                        'user_defined' => false,
                        'default' => '0',
                        'searchable' => false,
                        'filterable' => false,
                        'comparable' => false,
                        'visible_on_front' => false,
                        'used_in_product_listing' => true,
                        'unique' => false,
                        'apply_to' => 'simple,configurable,virtual,bundle,downloadable'
                    ]
                );        
            }
        $setup->endSetup();
    }
}

二 通过observer控制显示xml

app\code\CP\Lessohomeppw\Observer\ProductViewLayout.php

/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace CP\Lessohomeppw\Observer;
use Magento\Framework\Event\ObserverInterface;


class ProductViewLayout implements ObserverInterface
{
    protected $_resultPageFactory;

    public function __construct(\Magento\Framework\View\Result\PageFactory $resultPageFactory) {
        $this->_resultPageFactory = $resultPageFactory;
    }
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
        $_product = $objectManager->create('Magento\Catalog\Model\Product')->load($observer->getProduct()->getId());
      $is_add_to_cart = $_product->getData('pdp_add_cart');
        if(isset($is_add_to_cart)&&$is_add_to_cart==1){
            $page = $this->_resultPageFactory->create();
            $page->addHandle('catalog_product_custom_layout');
        }
        return $this;
    }
}

三 添加event.xml

app\code\CP\Lessohomeppw\etc\frontend\events.xml

四 添加配置xml文件 这里就是对应开启购买显示的xml配置，因为默认配置文件是不予显示购买，所以这里配置有购买功能的xml

app\code\CP\Lessohomeppw\view\frontend\layout\catalog_product_custom_layout.xml

    
        
            
                images/logo.svg
            
        
        
        
        
        
        
        
            
         
        
        
        
        
            
            
         
         
         
        
        
        
               
        
        
                
        
        
        
        
                 
        
        
        
        
        
        

        
        
            
            
            
                
                    
                        order_link
                    
                
            
        
        
        
        
        
        

        
            
            
        
                
  
    

五 module 模块更新

app\code\CP\Lessohomeppw\etc\module.xml

Done

后台显示

前台两种界面

展示界面

销售界面