CakePHP 2.9連接查詢返回錯誤的結果

Question

我正在使用以下（工作）MySQL查詢來獲取collection_keyword的所有collection_items的計數

SELECT ck.id
     , ck.working_title
     , count(*) as matches 
  FROM collection_keywords ck
  JOIN collection_keywords_collection_items ckci 
    ON ckci.collection_keyword_id = ck.id
  JOIN nl_collection_items nci 
    ON nci.id = ckci.collection_item_id
 GROUP 
    BY ck.id

SQL小提琴： http ：//sqlfiddle.com/#！9/7b4b0a/1

返回以下信息

+----+---------------+---------+
| id | working_title | matches |
+----+---------------+---------+
|  1 | First Title   |       5 |
|  2 | Second Title  |      10 |
|  3 | Third Title   |      15 |
+----+---------------+---------+

我正在嘗試使用CakePHP 2.9。使用join方法復制此查詢，但是

結果是空的

這是我的CakePHP代碼

$collectionKeywords = $this->CollectionKeyword->find('all', array(
    'contain' => array(),
    'fields' => array('CollectionKeyword.id, CollectionKeyword.working_title', 'count(*) AS matches'),
    'joins' => array(
        array(
            'table' => 'collection_keywords_collection_items',
            'type' => 'INNER',
            'conditions' => array(
                'collection_keywords_collection_items.collection_keyword_id' => 'CollectionKeyword.id'
            )
        )
    ),
    'group' => 'CollectionKeyword.id',
));

關系定義如下

class CollectionKeyword extends PluginCollectionKeyword
{
    public $hasAndBelongsToMany = array(
        'CollectionItem' => array(
            'className' => 'CollectionItem',
            'joinTable' => 'collection_keywords_collection_items',
            'foreignKey' => 'collection_keyword_id',
            'associationForeignKey' => 'collection_item_id',
        )
    );
}

和CollectionItem的關系

class CollectionItem extends PluginCollectionItem
{

    public $hasAndBelongsToMany = array(
        'CollectionKeyword' => array(
            'className' => 'CollectionKeyword',
            'joinTable' => 'collection_keywords_collection_items',
            'foreignKey' => 'collection_item_id',
            'associationForeignKey' => 'collection_keyword_id',
        ),

    );
}

Answer 1

我在您的代碼中發現的一些問題：

1. Join的數組鍵應該是joins 。 你使用過join 。

2. 缺少第二次內部連接的條件。

這是有效的代碼。

 $collectionKeywords = $this->CollectionKeyword->find('all', array(
    'contain' => array(),
    'fields' => array('CollectionKeyword.id, CollectionKeyword.working_title', 'count(*) AS matches'),
    'recursive' => -1,
    'joins' => array(
        array(
            'table' => 'collection_keywords_collection_items',
            'type' => 'INNER',
            'conditions' => array(
                "collection_keywords_collection_items.collection_keyword_id = CollectionKeyword`.id"
            )
        ),
        array(
            'table' => 'collection_items',
            'type' => 'INNER',
            'conditions' => array(
                "collection_items.id = collection_keywords_collection_items.collection_item_id"
            )
        ),        
    ),
    'group' => 'CollectionKeyword.id',
    ));

它產生以下查詢

SELECT CollectionKeyword.id, CollectionKeyword.working_title, count(*) AS matches FROM `collection_keywords` AS `CollectionKeyword` INNER JOIN `collection_keywords_collection_items` ON (`collection_keywords_collection_items`.`collection_keyword_id` = `CollectionKeyword`.`id`) INNER JOIN `collection_items` ON (`collection_items`.`id` = `collection_keywords_collection_items`.`collection_item_id`) WHERE 1 = 1 GROUP BY `CollectionKeyword`.`id`

根據您使用的Cakephp版本，您可以驗證使用此代碼運行的上次查詢。