Magento - 扩展相同核心类的多个类

Magento - multiple classes extending same core class(Magento - 扩展相同核心类的多个类)

问题描述

我相信我们都遇到过这样的情况:您有多个扩展，其中一个块或模型重写了相同的核心块/模型.我遇到的问题是:你如何控制 Magento 看到这些类的顺序?

I'm sure we've all run into a situation where you have multiple extensions with a block or model that rewrites the same core block/model. The problem I've run into is this: How do you control the order in which Magento sees these classes?

例如，假设我们有 2 个扩展，包含以下 2 个类:

For example, let's say we have 2 extensions with the following 2 classes:

config.xml

<catalog>
    <rewrite>
        <product_view>My_ClassA_Block_Catalog_Product_View</product_view>
    </rewrite>
</catalog>

My/ClassA/Block/Catalog/Product/View.php

class My_ClassA_Block_Catalog_Product_View extends Mage_Catalog_Block_Product_View {}

B级

<catalog>
    <rewrite>
        <product_view>My_ClassB_Block_Catalog_Product_View</product_view>
    </rewrite>
</catalog>

My/ClassB/Block/Catalog/Product/View.php

class My_ClassB_Block_Catalog_Product_View extends Mage_Catalog_Block_Product_View {}

--

推荐的解决方案是更改其中一个，以便它们扩展另一个并将它们链接在一起(class A extends B {}，class B extends C {}，等):

My/ClassA/Block/Catalog/Product/View.php

class My_ClassA_Block_Catalog_Product_View extends My_ClassB_Block_Catalog_Product_View {}

My/ClassB/Block/Catalog/Product/View.php

class My_ClassB_Block_Catalog_Product_View extends Mage_Catalog_Block_Product_View {}

--

我遇到的问题是 Magento 不一定是这样看的.我不知道它是按字母顺序排列的还是有点随机的，但有时这有效，有时则无效.在某些情况下，Magento 会优先使用 ClassB，所有对 createBlock('catalog/product_view') 的调用都会创建一个 ClassB 的实例，完全绕过ClassA 中的任何代码.

--

The problem I've run into is that Magento doesn't necessarily see it that way. I don't know if it's alphabetical or somewhat random, but sometimes this works and sometimes it doesn't. In some cases, Magento gives priority to ClassB and all calls to createBlock('catalog/product_view') create an instance of ClassB, completely bypassing any code in ClassA.

所以我的问题是:当 2 个不同的扩展都重写核心 catalog_product_view 类时，我如何控制 createBlock('catalog/product_view') 实例化哪个类?

So my question is this: How do I control which class gets instantiated by createBlock('catalog/product_view') when 2 different extensions both rewrite the core catalog_product_view class?

推荐答案

当 Magento 获取用于特定块的类时，它会在合并的 config.xml 树中查找

catalog/rewrite/product_view

app/etc/modules/*.xml