如何从 opencart 2.3 中的系统购物车库访问位于目录中的自定义模型

Question

我正在通过修改将此代码添加到系统购物车库中以访问位于 catalog/model/extension/folder_name/file_name:

中的自定义模型

public function __construct($registry) {
global $loader;
$loader->model('extension/folder_name/file_name');
$this->model = $registry->get('model_extension_folder_name_file_name');
}

但它说： 致命错误：未捕获错误：调用成员函数 model() on null 在 opencart 2.3.0.2

虽然我在 opencart 2.2.0.0 上工作时这段代码没问题。

请帮忙...

Answer 1

你的想法是正确的，只是一个语法错误。

在控制器文件中的 OpenCart 中，通过 $this->load->model()

访问加载器

但是在 system/library/cart/cart.php 你的代码应该是这样的

public function __construct($registry) {
    $registry->get('load')->model('extension/folder_name/file_name');
    $this->model = $registry->get('model_extension_folder_name_file_name');
}

This is because you are accessing directly in system/library/cart/cart.php, where you have access to the $registry from the construct but no __get() and __set() functions like the controllers and models have.

The cool thing is, the $this->load->model method actually checks where the cart is being called (is it from catalog folder or admin folder) and loads accordingly.

You can be safe to load a model in cart.php because it is only called in catalog folder, but be careful adding such code to system/library/request.php which is loaded both in catalog and admin. this will creat errors.