CakePHP：查询两次打印相同的值

Question

我正在开发 CakePHP 3.2。

我有 categories、products、seller_products table，它们的关联是

categories->hasMany('Products');
seller_products->hasMany('Products');

我必须按类别检索所有产品组，其中 seller_products.stock > 0

这就是我正在做的

$pros1 = $this->Products->Categories->find()
          ->where([
            'Categories.status' => 0,
          ])
          ->contain([
            'Products.SellerProducts', 'Subcategories', 'Subcategories.ProductTypes'
          ])
          ->matching('Products.SellerProducts', function(\Cake\ORM\Query $q) {
            return $q->where(['SellerProducts.stock >' => 0]);
          });

但在调试时，它两次返回相同的值。 foreach($pros1 as $p){debug($p);} 两次打印相同的值

/src/Controller/PagesController.php (line 120)

object(App\Model\Entity\Category) {

    'id' => (int) 1,
    'title' => 'Electronics',
    'description' => '',
    'icon' => 'fa-television',
    'status' => (int) 0,
    'created' => object(Cake\I18n\Time) {
       .........
     }

/src/Controller/PagesController.php (line 120)

object(App\Model\Entity\Category) {

    'id' => (int) 1,
    'title' => 'Electronics',
    'description' => '',
    'icon' => 'fa-television',
    'status' => (int) 0,
    'created' => object(Cake\I18n\Time) {
       .........
     }

和 debug(count($pros1)) 打印 1

Answer 1

引自文档：

As this function will create an INNER JOIN, you might want to consider calling distinct on the find query as you might get duplicate rows if your conditions don’t exclude them already. This might be the case, for example, when the same users comments more than once on a single article.

Cookbook > Database Access & ORM > Query Builder > Filtering by Associated Data

在您的案例中，有多个属于同一类别的匹配产品。因此，要么对表主键使用不同的 select，要么按它分组 (there may be no difference between the two)。

$pros1 = $this->Products->Categories
    ->find()
    ->distinct('Categories.id')
    // ...

    // ...
    ->matching(/* ... */)
    ->group('Categories.id');

另见

CakePHP：查询两次打印相同的值

CakePHP : query printing same values twice

cakephp

cakephp-3.2