我尝试遍历CakePHP模型上的关系。这是数据库:
我可以访问产品型号的产品属性(product->attributes
),但无法访问广告型号的产品属性(ad->product->attributes
)。
下面是我的代码:
//Product Model
class Product extends AppModel {
public $useTable = 'products';
public $displayField = 'name';
public $hasAndBelongsToMany = array(
'Attributes' =>
array(
'className' => 'Attribute',
'joinTable' => 'product_has_attributes',
'foreignKey' => 'products_id',
'associationForeignKey' => 'attributes_id',
'unique' => true,
'conditions' => '',
'fields' => '',
'order' => '',
'limit' => '',
'offset' => '',
'finderQuery' => '',
'with' => 'product_has_attributes'
)
);
public $hasMany = array(
'Ads' => array(
'className' => 'Ad',
'foreignKey' => 'Products_id',
'conditions' => '',
'order' => '',
'limit' => '',
'dependent' => true
)
);
//Ad Model
class Ad extends AppModel {
public $displayField = 'Name';
public $belongsTo = array(
'Product' => array(
'className' => 'Products',
'foreignKey' => 'products_id',
'conditions' => '',
'fields' => '',
'order' => ''
)
);
//Attribute Model
class Attribute extends AppModel {
public $displayField = 'name';
public $hasAndBelongsToMany = array(
'Products' =>
array(
'className' => 'Product',
'joinTable' => 'product_has_attributes',
'foreignKey' => 'attributes_id',
'associationForeignKey' => 'products_id',
'unique' => true,
'conditions' => '',
'fields' => '',
'order' => '',
'limit' => '',
'offset' => '',
'finderQuery' => '',
'with' => 'product_has_attributes'
)
);
// Products controller -> Action View
class ProductsController extends AppController {
public function view($id = null) {
if (!$this->Product->exists($id)) {
throw new NotFoundException(__('Invalid product'));
}
$options = array('conditions' => array('Product.' . $this->Product->primaryKey => $id));
$this->set('product', $this->Product->find('first', $options));
}
}
// Ads controller -> Action View
class AdsController extends AppController {
public function view($id = null) {
if (!$this->Ad->exists($id)) {
throw new NotFoundException(__('Invalid ad'));
}
$options = array('conditions' => array('Ad.' . $this->Ad->primaryKey => $id));
$this->set('ad', $this->Ad->find('first', $options));
}
下面是我在视图中所做的:
//Products Views: snipet of view.ctp
print_r ($product);
// this prints rhe product and all associated attributes
//Ads Views: snipet of view.ctp
print_r ($ad['Product']);
//this will print only the product fields, but not the attributes associated to the product
怎么了?我如何从我的广告模型中访问关系Ad->product->attribute
?
2条答案
按热度按时间yc0p9oo01#
我可以想到几个简单的方法来完成这一点。
第一:
这将是最简单的代码更改,以确保您获得与返回的产品相关的属性。
否则,您在问题中就暗示了这一点。您可以通过模型访问相关的Model,因此:
当在条件中使用相关模型时,我遇到了Cake不喜欢我的查找条件的问题,我不确定正确的语法,但如果你想继续研究,我相信你可以通过文档或实验来找到它。
最后,我建议您检查ContainableBehavior,它允许您微调结果中实际返回的字段。我希望这能回答您的问题!
rfbsl7qr2#
问题可能是您没有使用CakePHP的约定。
从文档中:
新连接表的名称需要包括所涉及的两个模型的名称,按字母顺序排列,并以下划线(_)分隔。
因此,您的连接表应命名为
attributes_products
。另外,检查外键,它们应该是单数形式。
希望这能解决问题。
http://book.cakephp.org/2.0/en/models/associations-linking-models-together.html#hasandbelongstomany-habtm
http://book.cakephp.org/2.0/en/getting-started/cakephp-conventions.html#model-and-database-conventions