CakePHP：過濾器和外鍵！不工作

Question

我在這裏試圖理解的是，這個錯誤是什麼意思，我做錯了什麼？我必須搞砸命名約定。

我的模特兒是產品和類別。類別具有hasMany並且產品具有belongsTo。

http://webdesign4.georgianc.on.ca/~100141468/comp2084/todo/products/add

http://webdesign4.georgianc.on.ca/~100141468/comp2084/todo/products/filter/9

姓名Y

套印Y

的ProductsController

function filter($category_id) { 
      $this->set('Product',$this->Product->findAllByCategoryId($category_id)); 
     } 

添加

$this->loadModel('Category'); 
$this->set('Categorys',$this->Category->find('list',array('order'=> array('Category.name')))); 

filter.ctp

<? foreach($Product as $row): ?> 
    <tr><td> 
<?=$row['Product']['id']?> 
</td><td> 
<?=$row['Product']['name']?> 
</td><td> 
<?=$row['Product']['price']?> 
</td><td> 
<?=$row['Category']['name']?> 
</td><td> 
<a href="edit/<?=$row['Product']['id']?>">Edit</a> 
    </td></tr> 
<? endforeach; ?> 

add.ctp

<?php 
     echo $this ->Form->input('name'); 
     echo $this ->Form->input('description'); 
     echo $this ->Form->input('price'); 
     echo $this ->Form->input('file', array('type' => 'file')); 
     echo $this ->Form->input('Category_id'); 
     echo $this ->Form->end('submit',true); 
     ?> 

Answer 1

開始做一個debug($Product);你看到一個Category關鍵？如果沒有，則設置遞歸更高或者更好使用Containable。

你的附加組件，視圖VAR名稱更改爲categories和表單輸入字段更改爲category_id（也就是說，如果你已經按照約定在數據庫中，這只是一個錯字）

如果類是有關產品，不需要loadModel。

根本就$this->Product->Category->find...

Answer 2

，這是非常simple..you不抓餅基本面。我建議再次閱讀本書和教程，重點關注命名約定和關聯。

您到位需要這些協會：

//product.php 
var $belongsTo = array(
    'Category' => array(
     'className' => 'Category', 
     'foreignKey' => 'category_id', 
     'conditions' => '', 
     'fields' => '', 
     'order' => '' 
    )); 


// category.php 
var $hasMany = array(
    'Product' => array(
     'className' => 'Product', 
     'foreignKey' => 'category_id' 
    ) 
); 



// products_controller.php 
function filter($category_id) { 
    $this->set('products', $this->Product->findAllByCategoryId($category_id)); 
} 

function add() { 
    if (!empty($this->data)) { 
     $this->Product->create(); 
     if ($this->Product->save($this->data)) { 
      $this->Session->setFlash(__('The Product has been saved', true)); 
      $this->redirect(array('action' => 'index')); 
     } else { 
      $this->Session->setFlash(__('The Product could not be saved. Please, try again.', true)); 
     } 
    } 
    $categories = $this->Product->Category->find('list'); 
    $this->set(compact(array('categories'))); 
} 

    // filter.ctp 
    debug($products); // just to see what data has been returned 

    // add.ctp 
    echo $this->Form->create('Product'); 
    echo $this->Form->input('name'); 
    echo $this->Form->input('description'); 
    echo $this->Form->input('price'); 
    echo $this->Form->input('file', array('type' => 'file')); 
    echo $this->Form->input('category_id'); // categories 
    echo $this->Form->end('submit',true); 

清除緩存，並且這應該工作。