在 null 上调用成员函数 helper() [英] Call to a member function helper() on null

问题描述

我正在尝试找出 codeigniter，但目前无法插入到我的数据库中.我一直在关注从数据库读取成功的官方文档.我的错误完整:

I am trying to figure out codeigniter and currently cannot insert into my database. I've been following the official documentation having success with reading from the DB. My error in full:

遇到未捕获的异常类型:错误

An uncaught Exception was encountered Type: Error

消息:在 null 时调用成员函数 helper()

Message: Call to a member function helper() on null

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

Filename: /Library/WebServer/Documents/codeChallenge/system/libraries/Form_validation.php

行号:147

回溯:

文件:/Library/WebServer/Documents/codeChallenge/application/models/People_model.php行:6 函数:__construct

File: /Library/WebServer/Documents/codeChallenge/application/models/People_model.php Line: 6 Function: __construct

文件:/Library/WebServer/Documents/codeChallenge/application/controllers/People.php行:7 功能:模型

File: /Library/WebServer/Documents/codeChallenge/application/controllers/People.php Line: 7 Function: model

文件:/Library/WebServer/Documents/codeChallenge/index.php 行:315函数:require_once

File: /Library/WebServer/Documents/codeChallenge/index.php Line: 315 Function: require_once

解决此错误的解决方案是什么?

What is the solution to resolve this error?

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);
    }
    }

查看:

    <h2>Create a record</h2>

    <?php echo validation_errors(); ?>

    <?php echo form_open('people/create'); ?>

    <label for="name">Name</label>
    <input type="text" name="name" /><br />

    <label for="age">Age</label>
    <input type="text" name="age" /><br />

    <label for="city">City</label>
    <input type="text" name="city" /><br />

    <label for="province">Province</label>
    <input type="text" name="province" /><br />

    <label for="country">Country</label>
    <input type="text" name="country" /><br />

    <input type="submit" name="submit" value="Create people item" />

    </form>

路线:

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

推荐答案

在您的示例中 People_model 是一个模型，但您将其扩展为控制器.

in your example People_model is a model, but you extend it as a Controller.

改变:

class People_model extends CI_Controller 

进入

class People_model extends CI_Model 

分析错误消息有帮助，它说(除其他外)

analyzing the error message helps, it says (among other stuff)

文件:/Library/WebServer/Documents/codeChallenge/application/models/People_model.php行:6 函数:__construct

File: /Library/WebServer/Documents/codeChallenge/application/models/People_model.php Line: 6 Function: __construct

检查People_model 会导致将模型扩展为控制器的错误

checking People_model leads you to the mistake extending the model as controller

这篇关于在 null 上调用成员函数 helper()的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！