Codeigniter扩展自定义模型会产生严重错误 [英] Codeigniter Extend custom model produces FATAL ERROR

问题描述

我有一个类可以扩展CI_Model：

我已经看过几个不同的帖子， p>

  class Users_Model extends CI_Model {
 
 public function __construct（）{
 parent :: __ construct ）; 
} 
  

，然后：

  class Students_Model extends Users_Model {
 
 private $ _students; 
 
 public function __construct（）{
 parent :: __ construct（）; 
 
 $ this-> _students = $ this-> get_students（）;然而，我会收到此错误消息：
 
 
 
 
 
  PHP致命错误：未在/Users/rosswilson/Localhost/thedrumrooms/dreamweaver/ci/application/models/students_model.php中找到类'Users_Model 
  
我使用 require_once 扩展类和它的工作原理。 
这是最佳做法/正确的方法吗？
 
 
 
谢谢。
方案
 CI的标准做法是在 application / core 中创建一个名为 MY_Model.php ， MY _ 取决于您配置中定义的内容。
 
 
 
 > MY_Model.php 你可以在该文件中定义许多类，你可以在你的模型中扩展，基本上CodeIgniter的负载模型在这个路径和文件中查找已定义的类。
 
 
 
但是如果你想使用 require_once ，你必须使用 APPPATH  应用程序路径）定义在 index.php 。但是您的自定义模型仍然必须扩展 CI_Model ，因为它使用CI模型的核心类或您的模型将无法工作。
 
 
 
 ex  require_once APPPATH。'/ models / test.php';  
 
 
 
  ： 
 
 
 
谢谢@dean或指出。在 MY_Model.php 文件中，必须 是 MY_Model类扩展 CI_Model 。
 
I've seen a few different posts on this, but none of them seem to be working for me.

I have one class that extends CI_Model:
class Users_Model extends CI_Model {

public function __construct(){
    parent::__construct();
}
and then:
class Students_Model extends Users_Model {

private $_students;

public function __construct(){
      parent::__construct();

      $this->_students = $this->get_students();
}
However I then receive this error message:
PHP Fatal error:  Class 'Users_Model' not found in /Users/rosswilson/Localhost/thedrumrooms/dreamweaver/ci/application/models/students_model.php
I've used require_once to include the file in the extended class and it works.
Is this the best practice/correct way to do this?

Thanks.
解决方案
The standard practice in CI is to create a Base Model inside application/core named MY_Model.php , MY_ depends on what is defined in your config.

Then inside your MY_Model.php you can have many classes defined in that file that you can extend in your Model, basically CodeIgniter's load model looks for defined classes on this path and file.

But if you want to use require_once you have to use the APPPATH(application path) as defined on index.php. But your custom model would still have to extend CI_Model as it uses the core class for CI Model or your model will not work.

ex require_once APPPATH.'/models/test.php';

ADDED NOTES:

thank you @dean Or for pointing that out. Inside the MY_Model.php file there must be a MY_Model class that Extends the CI_Model.

                        
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