模型上的codeigniter未定义属性错误

Question

我的模型出现未定义属性错误。我正在使用火柴盒库进行模块化分离。我的 mproduct 模型是：

class MProducts extends Model{
    /* function MProducts(){
        $this->load->module_model('cities','MCities');
     }*/

    public $home_city_id ='';

    function __construct(){
        parent::Model();
        $this->home_city_id = $this->MCities->getHomeCityId();
    }
}

我得到这个错误：

A PHP Error was encountered

Severity: Notice

Message: Undefined property: MProducts::$MCities

Filename: models/mproducts.php

Line Number: 12

我的城市模型是：

class MCities extends Model{

    function MCities(){
        parent::Model();
    }
function getHomeCityId(){
        $city = get_cookie('home_city');
         $this->db->select('id');
         $this->db->where('name', $city);
         $Q = $this->db->get('omc_cities');
         if($Q->num_rows() > 0){
             foreach ($Q->result_array() as $row){
             return $row['id'];
           }
        }
    }

}

我也不知道哪条路是错的。

已编辑 我的产品控制器是这样的：

class Admin extends Shop_Admin_Controller {
    function Admin(){
        parent::Shop_Admin_Controller();
        // Check for access permission
        check('Products');
        // load modules/categories/model/mcats
         $this->load->module_model('categories','MCats');
        // load the MProducts model
        $this->load->model('MProducts');
        // load modules/cities/model/mcities
        $this->load->module_model('cities','MCities');
        // Set breadcrumb
        $this->bep_site->set_crumb($this->lang->line('backendpro_products'),'products/admin');       
    }


    function index(){
        // Setting variables
        $data['title'] = "Manage Products";
        $data['products'] = $this->MProducts->getAllProducts();
        $data['cities'] = $this->MCities->getCitiesDropDown();
        $data['categories'] = $this->MCats->getCategoriesDropDown();
        // we are pulling a header word from language file
        $data['header'] = $this->lang->line('backendpro_access_control');
        $data['page'] = $this->config->item('backendpro_template_admin') . "admin_product_home";
        $data['module'] = 'products';
        $this->load->view($this->_container,$data);
    }
}

Answer 1

在您的 MProducts 构造函数中，您执行以下操作：$this->MCities->getHomeCityId(); 这意味着您尝试获取 MProducts 对象的 MCities var，然后调用该对象的 getHomeCityId();，这将不起作用，因为在那里查看您的 MProducts不是MCities var。

编辑： 您必须在模型中获取一个 codeigniter 实例并从 CI 实例中检索 MCities 模型。

MProducts 应该是这样的：

class MProducts extends Model{
    /* function MProducts(){
        $this->load->module_model('cities','MCities');
     }*/

    public $home_city_id ='';

    function __construct(){
        parent::Model();
        $CI =& get_instance();

        $this->home_city_id = $CI->MCities->getHomeCityId()->getHomeCityId();
    }
}

我希望这会有所帮助。