基于自定义规则的 CakePHP3 过滤

Question

我有以下架构：

User hasMany RegistrationState RegistrationState belongsTo User

到其经典的 1->M 关系，其中 user_id 在 RegistrationState table 中。

RegistrationState 具有以下属性

id, user_id, state, created_at ... ( others are not relevant )

用户可以有更多的注册状态例如：

Registration state -> 1, created -> 01-02-2017
Registration state -> 2, created -> 01-03-2017
Registration state -> 3, created -> 01-04-2017
Registration state -> 4, created -> 01-05-2017
Registration state -> 2, created -> 01-06-2017
Registration state -> 3, created -> 01-07-2017

我需要根据这个 'state property' 进行过滤，其中有效状态是最后创建的状态。

此示例的有效状态是 3，因为它是最新状态。

现在，我有控制器和 index 方法，我有

    // push custom query for filtering to finder method
    $this->paginate['finder'] = [
        'clients' => ['q' => $this->request->query]
    ];

    try {
        $clients = $this->paginate( $this->Users );
    } catch (\Exception $e) {
        // redirect on main
        return $this->redirect($this->here);
    }

我的 finder 方法如下所示

public function findClients($query, array $options)
{
    $opts = $query->getOptions()['q'];

    if (!empty($opts['email'])) {
        $query->andWhere(['email LIKE' => '%' . trim($opts['email']) . '%']);
    }

    if (!empty($opts['identity_num'])) {
        $cn = $opts['identity_num'];
        $query->matching('Identities', function ($query) use ($cn) {
            $query->andWhere(['Identities.number' => $cn]);
        });
    }

    // registration state
    if (!empty($opts['reg_state'])) {
        // WHAT SHOULD BE HERE???
    }

    return $query;
}

还有另一个 1->M 关系 User -> Identity，但是（匹配方法）但效果很好，因为数字始终是唯一的。

我无法解决注册状态的问题，如何在 CakePHP3 中实现这种搜索？（我不想破坏分页，所以我想在 finder 方法中解决这个问题）

Answer 1

一个可能的（肮脏的？）解决方案是子查询（ RegistrationState 上的 INNER JOIN ）

    // registration state
    if (!empty($opts['reg_state'])) {

        $conn = ConnectionManager::get('default');


        $subquery = $conn->execute(
                'SELECT uir.user_id ' .
                'FROM registration_state uir ' .
                'INNER JOIN ( ' . 
                    'SELECT user_id, max(created) as m_created ' .
                    'FROM registration_state ' .
                    'GROUP BY user_id ' .
                ') muir ON uir.user_id = muir.user_id AND uir.created = muir.m_created AND uir.status = '
                . intval( $opts['reg_state'])
        );

        $usersInStateIds = [];
        // transform result of subquery to usable array
        foreach( $subquery->fetchAll('assoc') as $r ) {
            $usersInStateIds[] = intval( $r['user_id'] );
        }
        $query->matching('RegistrationState', function ($query) use ($usersInStateIds) {
            return $query->andWhere(['RegistrationState.user_id IN' => $usersInStateIds]);
        });
    }

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