Question

何在cakephp 3.x中进行递归

我有4张桌子

users

----------
|id|name |
|1 | mick|
----------

responses
-------------------------
id|question_id| response|
1 |      1    | slim    |   
-------------------------

questions
------------------
id   |  question  |
1    | body type  |
-------------------

user_respopnses
----------------------------------------------
id  |  user_id  | question_id  | response_id |
1   |  1        |  1           |    1        |
----------------------------------------------

以下查询由Cakephp自动生成以获取数据

$users = $this->Users->get($id, [
    'contain' => ['Responses' ]    
    ]);

通过运行以上查询

进行响应

Id   Question Id       Response         Actions
1        1               slim      View Edit Delete

我需要显示问题属性（文本）而不是问题ID但是卡住了。

用户表中定义的关系

    $this->table('users');
    $this->displayField('id');
    $this->primaryKey('id');
    $this->addBehavior('Timestamp');

    $this->belongsToMany('Responses', [
        'foreignKey' => 'user_id',
        'targetForeignKey' => 'response_id',
        'joinTable' => 'users_responses'
    ]);
}

调试后我得到了这个数据

'responses' => [
        (int) 0 => object(App\Model\Entity\Response) {

            'id' => (int) 1,
            'question_id' => (int) 1,
            'response' => 'slim',
            '_joinData' => object(Cake\ORM\Entity) {

                'response_id' => (int) 1,
                'id' => (int) 1,
                'user_id' => (int) 1,
                'question_id' => (int) 1,
                '[new]' => false,
                '[accessible]' => [
                    '*' => true
                ],
                '[dirty]' => [],
                '[original]' => [],
                '[virtual]' => [],
                '[errors]' => [],
                '[invalid]' => [],
                '[repository]' => 'UsersResponses'

            },

实际上，User与Responses表有关系并且与Questions表没有关联，但是我们可以从第3个表“users_responses”获取它们，因为这个表有question_id，user_id，reponse_id。但是cakephp 3.x不允许递归。现在只查询命中响应表和users_response表。任何有关解决这个问题的建议或暗示都值得赞赏。

按照SQL查询实现我想要的结果（我使用了user_id = 4静态值，因为它在mysqlyog上运行）

SELECT users.id , questions.question, responses.response 
FROM questions, responses, users_responses , users
WHERE
users.id = 4 AND

   users_responses.user_id = 4 AND users_responses.response_id = responses.id
   AND
   users_responses.question_id = responses.question_id

   AND
   responses.question_id = questions.id;

Answer 1

＆＃34;递归＆＃34;这里不是一个正确的词，但你想要的是

$users = $this->Users->get($id, [
    'contain' => ['Responses' => ['Questions']]    
]);

在手册的Eager Loading Associations部分中已经清楚地描述了这一点。

从cakephp 3.x中的第三个关联表中获取数据

1 个答案: