CodeIgniter - 未定义的属性错误

时间:2014-09-26 03:07:41

标签: php codeigniter properties undefined

我正在尝试访问表格中的所有乐队并将其打印在列表中,但是当我运行它时,我收到此错误:

Severity: Notice

Message: Undefined property: CI_Loader::$model_bands

Filename: views/band_view.php

Line Number: 16

band_view.php:

<h3>List of Bands:</h3>
<?php
$bands = $this->model_bands->getAllBands();

echo $bands;
?>

model_bands.php:

function getAllBands() {
    $query = $this->db->query('SELECT band_name FROM bands');
    return $query->result();    
}

有人可以告诉我为什么会这样做吗?

4 个答案:

答案 0 :(得分:2)

为什么需要这样做,正确的方法是在控制器中使用模型方法,然后将其传递给视图:

public function controller_name()
{
    $data = array();
    $this->load->model('Model_bands'); // load the model
    $bands = $this->model_bands->getAllBands(); // use the method
    $data['bands'] = $bands; // put it inside a parent array
    $this->load->view('view_name', $data); // load the gathered data into the view
}

然后在视图中使用$bands(循环)。

<h3>List of Bands:</h3>
<?php foreach($bands as $band): ?>
    <p><?php echo $band->band_name; ?></p><br/>
<?php endforeach; ?>

答案 1 :(得分:1)

您是否在控制器中加载了模型?

    $this->load->model("model_bands");

答案 2 :(得分:0)

您需要更改代码 控制器

public function AllBrands() 
{
    $data = array();
    $this->load->model('model_bands'); // load the model
    $bands = $this->model_bands->getAllBands(); // use the method
    $data['bands'] = $bands; // put it inside a parent array
    $this->load->view('band_view', $data); // load the gathered data into the view
}

然后查看

<h3>List of Bands:</h3>
<?php foreach($bands as $band){ ?>
    <p><?php echo $band->band_name; ?></p><br/>
<?php } ?>

你的模型没问题

function getAllBands() {
    $query = $this->db->query('SELECT band_name FROM bands');
    return $query->result();    
}

答案 3 :(得分:0)

您忘了在控制器上加载模型:

//controller

function __construct()
{
    $this->load->model('model_bands'); // load the model
}
顺便说一下,你为什么直接从你的视角中调用模型?应该是:

//model
$bands = $this->model_bands->getAllBands();
$this->load->view('band_view', array('bands' => $bands));

//view
<h3>List of Bands:</h3>
<?php echo $bands;?>