CakePHP 3 - array_merge()：参数 #2 不是数组

Question

我正在开发的一个 CakePHP 3 应用程序出现一个奇怪的错误，我无法弄清楚问题是什么。应用程序和问题如下：

1. 我有一个愿望清单
2. 该愿望清单可以有许多愿望清单项目

3. 我正在使用 Angular/Ajax 拨打电话并删除 WishlistItem

   http://domain.com/wishlist_items/delete/219
   

4. 这不起作用，它返回以下错误：

   array_merge(): Argument #2 is not an array 
   
   /­vendor/­cakephp/­cakephp/­src/­ORM/­Association/­DependentDeleteTrait.php 54
   

5. 有问题的WishlistItemsController.php 是：

   public function delete($id = null) {
       $this->autoRender = false;
   
       $this->request->allowMethod(['post', 'delete']);
       $wishlistItem = $this->WishlistItems->get($id);
   
       if ($this->WishlistItems->delete($wishlistItem)) {
           echo json_encode(['message' => ['type' => 'success', 'text' => 'This wishlist item has been deleted successfully']]);
       }
       else {
           echo json_encode(['message' => ['type' => 'error', 'text' => 'This wishlist item could not be deleted']]);
       }
       return;
    }
   

6. 愿望清单项目没有依赖项，错误来自此文件http://api.cakephp.org/3.0/source-class-Cake.ORM.Association.DependentDeleteTrait.html#19-57 第 54 行

7. 我的表格文件如下所示：

   WishlistsTable.php
   
   $this->hasMany('WishlistItems', [
       'foreignKey' => 'wishlist_id',
       'dependent' => true,
       'cascadeCallbacks' => true,
   ]);
   
   ==================================================
   
   WishlistItemsTable.php
   
   $this->addBehavior('Timestamp');
   $this->addBehavior('Ratings.Ratable');
   $this->belongsTo('Wishlists', [
       'foreignKey' => 'wishlist_id'
   ]);
   
   $this->addBehavior('CounterCache', [
       'Wishlists' => ['items_count']
   ]);
   

我不明白为什么在此表没有任何依赖项时使用cascadeDelete 函数。

堆栈跟踪：

Whoops\Exception\ErrorException thrown with message "array_merge(): Argument #2 is not an array"

Stacktrace:
#15 Whoops\Exception\ErrorException in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/Association/DependentDeleteTrait.php:54
#14 Whoops\Run:handleError in /var/www/domain.com/dev/website/vendor/gourmet/whoops/src/Error/WhoopsHandler.php:27
#13 Gourmet\Whoops\Error\WhoopsHandler:_displayError in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/Error/BaseErrorHandler.php:139
#12 Cake\Error\BaseErrorHandler:handleError in <#unknown>:0
#11 array_merge in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/Association/DependentDeleteTrait.php:54
#10 Cake\ORM\Association\HasMany:cascadeDelete in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/AssociationCollection.php:273
#9 Cake\ORM\AssociationCollection:cascadeDelete in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/Table.php:1705
#8 Cake\ORM\Table:_processDelete in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/Table.php:1643
#7 Cake\ORM\Table:Cake\ORM\{closure} in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/Database/Connection.php:557
#6 Cake\Database\Connection:transactional in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/ORM/Table.php:1648
#5 Cake\ORM\Table:delete in /var/www/domain.com/dev/website/src/Controller/WishlistItemsController.php:139
#4 App\Controller\WishlistItemsController:delete in <#unknown>:0
#3 call_user_func_array in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/Controller/Controller.php:429
#2 Cake\Controller\Controller:invokeAction in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/Routing/Dispatcher.php:114
#1 Cake\Routing\Dispatcher:_invoke in /var/www/domain.com/dev/website/vendor/cakephp/cakephp/src/Routing/Dispatcher.php:87
#0 Cake\Routing\Dispatcher:dispatch in /var/www/domain.com/dev/website/webroot/index.php:37

Answer 1

如果在您调用delete() 的表对象上真的只有BelongsTo 关联，那么这种控制流永远不会发生，因此需要从其他地方定义更多关联。

鉴于 Ratings.Ratable 行为属于 dereuromark/cakephp-ratings，我怀疑问题在于为 HasMany 关联定义的条件，该行为添加到表中：

https://github.com/dereuromark/cakephp-ratings/.../Behavior/RatableBehavior.php#L85

$this->_table->hasMany('Ratings', [
        'className' => $this->_config['rateClass'],
        'foreignKey' => $this->_config['foreignKey'],
        'unique' => true,

        'conditions' => '', // <<<<<< There it is

        'fields' => '',
        'dependent' => true,
        //'table' => 'sandbox_ratings'
    ]
);

该值最终作为DependentDeleteTrait::cascadeDelete() 中的第二个参数传递给array_merge()，因此出现错误。

所以，这是插件中的一个错误，我建议您报告它。作为一种快速解决方法，您可以覆盖表类中的条件，例如

$this->association('Ratings')->conditions([]);