php - cakephp 加入查询不起作用

Question

我是 cake php 的新手。我想在两个表之间编写联接查询。这里我的查询是:

select * from deal_purchases as dp 
  join users as u on u.id = dp.user_id
  where dp.deal_id = 6
  group by user_id

这个查询运行完美。但是我想在 cakephp 中编写这个查询。我写了这样的查询:

$table = "deal_purchases";
$query['conditions'] = array('deal_purchases.deal_id'=>$deal_id);
$query['fields'] = array('deal_purchases.*','users.*');
$query['joins'] = array(
                    array(
                        'table'=>'users',
                        'alias'=>'users',
                        'type'=>'INNER',
                        'conditions'=>array('users.id = deal_purchases.user_id')
                        ),
                );
$query['group'] = array('deal_purchases.user_id');
$result = $this->find('all', $query);

此处未执行此查询，那么我该如何解决此问题？

Answer 1

请检查您的文件的以下内容:

您的 Controller 顶部“$uses”数组包含“DealPurchase”示例

class MerchantController extends AppController {
    var $uses = array(
        'DealPurchase'
    );

尝试以下操作

$query['conditions'] = array('DealPurchase.deal_id'=>$deal_id);
$query['fields'] = array('DealPurchase.*','User.*');
$query['joins'] = array(
                    array(
                        'table'=>'users',
                        'alias'=>'User',
                        'type'=>'INNER',
                        'conditions'=>array('User.id = DealPurchase.user_id')
                        ),
                );
$query['group'] = array('DealPurchase.user_id');
$result = $this->DealPurchase->find('all', $query);

数据库表 deal_purchases 模型名称应为 DealPurchase.php，格式如下

<?php 
class DealPurchase extends AppModel {
    var $name = "DealPurchase";
    //Relationship some tables
    //Validation here
}
?>

User.php模型(用户)

class User extends AppModel {
    var $name = "User"; 
    var $hasMany = array(
        'DealPurchase' => array(
            'className' => 'DealPurchase',
            'foreignKey' => 'user_id',
            'dependent' => true //true means when delete the user entry via coding then also deleted the deal_purchases entry also
        )
    );
    //validation
}

DealPurchase.php 模型(deal_purchases)

class DealPurchase extends AppModel {
    var $name = "DealPurchase"; 
    var $belongsTo = array(
        'User' => array(
            'className' => 'User',
            'foreignKey' => 'user_id'
        )
    );
    //validation
}