Php 在null上调用成员函数helper（）

我正试图找出codeigniter，目前无法插入到我的数据库中。我一直在关注官方文件，并成功地阅读了DB。我的全部错误：

遇到未捕获的异常类型：错误

消息：在null上调用成员函数helper（）

文件名： /Library/WebServer/Documents/codeChallenge/system/libraries/Form_validation.php

电话号码：147

回溯：

文件： /Library/WebServer/Documents/codeChallenge/application/models/People\u model.php 行：6函数：\构造

文件： /Library/WebServer/Documents/codeChallenge/application/controllers/People.php 第7行功能：型号

文件：/Library/WebServer/Documents/codeChallenge/index.php行：315 功能：需要一次

解决此错误的解决方案是什么

控制器：

class People extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->model('people_model');
        $this->load->helper('url_helper');
    }

    public function index()
    {
        $data['people'] = $this->people_model->get_people();
        $data['title'] = 'People';

        $this->load->view('templates/header', $data);
        $this->load->view('people/index', $data);
        $this->load->view('templates/footer');
    }

    public function view($id = NULL)
    {
        $data['people_item'] = $this->people_model->get_people($id);

        if (empty($data['people_item']))
        {
            show_404();
        }

        $this->load->view('templates/header', $data);
        $this->load->view('people/view', $data);
        $this->load->view('templates/footer');  
    }


    public function create()
    {
        $this->load->helper('form');
        $this->load->library('form_validation');

        $this->form_validation->set_rules('name', 'Name', 'required');
        $this->form_validation->set_rules('age', 'Age', 'required');
        $this->form_validation->set_rules('city', 'City', 'required');
        $this->form_validation->set_rules('province', 'Province', 'required');
        $this->form_validation->set_rules('country', 'Country', 'required');

        if ($this->form_validation->run() === FALSE)
        {
            $this->load->view('templates/header', $data);
            $this->load->view('people/create');
            $this->load->view('templates/footer');
        }
        else
        {
            $this->people_model->set_people();
            $this->load->view('people/success');
        }
    }
    } 

型号：

    <?php
    class People_model extends CI_Controller {

    public function __construct()
    {
        parent::__construct();
        $this->load->database();
    }

    public function get_people($id = FALSE)
    {
        if ($id === FALSE)
        {
            $query = $this->db->get('people');
            return $query->result_array();
        }

        $query = $this->db->get_where('people', array('id' => $id));
        return $query->row_array();
    }

    public function set_people()
    {
        $this->load->helper('url');

        $data = array (
            'name' => $this->input->post('name'),
            'age' => $this->input->post('age'),
            'city' => $this->input->post('city'),
            'province' => $this->input->post('province'),
            'country' => $this->input->post('country')
        );

        return $this->db->insert('people', $data);
    }
    }

---

在您的示例中，

People\u model

是一个模型，但您将其扩展为控制器

更改：

class People_model extends CI_Controller 

进入

它说，分析错误消息有帮助（除其他外）

文件： /Library/WebServer/Documents/codeChallenge/application/models/People\u model.php 行：6函数：\构造

---

检查

People\u model

会导致错误，将模型扩展为控制器

我怎么会错过这么简单的东西！感谢您指出我的错误。如果您仔细阅读错误消息，它实际上会给您一个提示：

Backtrace:File:/Library/WebServer/Documents/codeChallenge/application/models/People\u model.php行：6函数：\u构造

    $route['people/create'] = 'people/create';
    $route['people/(:any)'] = 'people/view/$1';
    $route['people'] = 'people';
    $route['(:any)'] = 'pages/view/$1';
    $route['default_controller'] = 'pages/view';

class People_model extends CI_Controller 

class People_model extends CI_Model