Magento2：更新核心文件中的一行代码

Question

这是我需要的：在文件 vendor/magento/module-sales-rule/Model/Rule/Action/Discount/CartFixed.php 中有一个 public 函数计算我想在不修改此核心文件的情况下评论此函数内的 If 条件。

if ($availableDiscountAmount > 0) {

我在自定义模块中创建了首选项，但它没有按预期工作。如果有人可以帮助我，我将不胜感激。

Answer 1

像这样使用

code/Magento/* any name or module you need from core file If you need some more details let me know it is just like Magento 1 but only folder is changed

Answer 2

要自定义 Magento 核心文件，您可以使用首选项或 Plugin。此处有更多详细信息

对于您的情况，您可以按照以下步骤使用首选项：

在di.xml中可以添加参考配置：

<preference for="Magento\SalesRule\Model\Rule\Action\Discount\CartFixed" type="Training\Test\Model\Rule\Action\Discount\CartFixed" />

创建Training\Test\Model\Rule\Action\Discount\CartFixed.php:

@作者 Bach Lee */

命名空间Training\Test\Model\Rule\Action\Discount；

使用Magento\Framework\App\ObjectManager；使用 Magento\Framework\Pricing\PriceCurrencyInterface；使用 Magento\SalesRule\Model\DeltaPriceRound；使用 Magento\SalesRule\Model\Validator；使用 Magento\SalesRule\Model\Rule\Action\DiscountFactory;

class CartFixed 扩展 \Magento\SalesRule\Model\Rule\Action\Discount\CartFixed { /** * @var 字符串 */ 私人静态 $discountType = 'CartFixed'; /** * @var DeltaPriceRound */ 私人 $deltaPriceRound;

/**
 * @param Validator $validator
 * @param DataFactory $discountDataFactory
 * @param PriceCurrencyInterface $priceCurrency
 * @param DeltaPriceRound $deltaPriceRound
 */
public function __construct(
    Validator $validator,
    DataFactory $discountDataFactory,
    PriceCurrencyInterface $priceCurrency,
    DeltaPriceRound $deltaPriceRound = null
) {
    $this->deltaPriceRound = $deltaPriceRound ?: ObjectManager::getInstance()->get(DeltaPriceRound::class);

    parent::__construct($validator, $discountDataFactory, $priceCurrency, $deltaPriceRound);
}

/**
 * @param \Magento\SalesRule\Model\Rule $rule
 * @param \Magento\Quote\Model\Quote\Item\AbstractItem $item
 * @param float $qty
 * @return \Magento\SalesRule\Model\Rule\Action\Discount\Data
 * @throws \Magento\Framework\Exception\LocalizedException
 */
public function calculate($rule, $item, $qty)
{
    /** @var \Magento\SalesRule\Model\Rule\Action\Discount\Data $discountData */
    $discountData = $this->discountFactory->create();

    $ruleTotals = $this->validator->getRuleItemTotalsInfo($rule->getId());

    $quote = $item->getQuote();
    $address = $item->getAddress();

    $itemPrice = $this->validator->getItemPrice($item);
    $baseItemPrice = $this->validator->getItemBasePrice($item);
    $itemOriginalPrice = $this->validator->getItemOriginalPrice($item);
    $baseItemOriginalPrice = $this->validator->getItemBaseOriginalPrice($item);

    /**
     * prevent applying whole cart discount for every shipping order, but only for first order
     */
    if ($quote->getIsMultiShipping()) {
        $usedForAddressId = $this->getCartFixedRuleUsedForAddress($rule->getId());
        if ($usedForAddressId && $usedForAddressId != $address->getId()) {
            return $discountData;
        } else {
            $this->setCartFixedRuleUsedForAddress($rule->getId(), $address->getId());
        }
    }
    $cartRules = $address->getCartFixedRules();
    if (!isset($cartRules[$rule->getId()])) {
        $cartRules[$rule->getId()] = $rule->getDiscountAmount();
    }

    $availableDiscountAmount = (float)$cartRules[$rule->getId()];
    $discountType = self::$discountType . $rule->getId();

    $store = $quote->getStore();
    if ($ruleTotals['items_count'] <= 1) {
        $quoteAmount = $this->priceCurrency->convert($availableDiscountAmount, $store);
        $baseDiscountAmount = min($baseItemPrice * $qty, $availableDiscountAmount);
        $this->deltaPriceRound->reset($discountType);
    } else {
        $ratio = $baseItemPrice * $qty / $ruleTotals['base_items_price'];
        $maximumItemDiscount = $this->deltaPriceRound->round(
            $rule->getDiscountAmount() * $ratio,
            $discountType
        );

        $quoteAmount = $this->priceCurrency->convert($maximumItemDiscount, $store);

        $baseDiscountAmount = min($baseItemPrice * $qty, $maximumItemDiscount);
        $this->validator->decrementRuleItemTotalsCount($rule->getId());
    }

    $baseDiscountAmount = $this->priceCurrency->round($baseDiscountAmount);

    $availableDiscountAmount -= $baseDiscountAmount;
    $cartRules[$rule->getId()] = $availableDiscountAmount;
    if ($availableDiscountAmount <= 0) {
        $this->deltaPriceRound->reset($discountType);
    }

    $discountData->setAmount($this->priceCurrency->round(min($itemPrice * $qty, $quoteAmount)));
    $discountData->setBaseAmount($baseDiscountAmount);
    $discountData->setOriginalAmount(min($itemOriginalPrice * $qty, $quoteAmount));
    $discountData->setBaseOriginalAmount($this->priceCurrency->round($baseItemOriginalPrice));
    $address->setCartFixedRules($cartRules);

    return $discountData;
}

}

或者您可以使用 cweagans/composer-patches following 编辑核心 Magento 文件

此致

Answer 3

App/Code/Magento/SalesRule/model/*

请这样使用

Answer 4

添加后请使用编译命令

Answer 5

对我有用，对你也有用

首先添加文件夹 App/Code/Magento/SalesRule/model/folder/file.php

并感谢使用 "setup:upgrade" 更新文件。比命令"setup:di:compile"。

问候纳西姆

Magento2：更新核心文件中的一行代码

Magento2: Updating a line of code in core file

php

magento2

magento-2.3