为belongsToMany CakePHP 3分页的条件

Question

我有表学期,学科和联合表学期七学期.我想在DisciplinesController中使用semester_id作为参数创建一个动作索引,该参数使用paginate列出属于学期的学科,参数中传递了id.我试过这个:

public function index($semester_id)
{
    $options = ['semester_id' => $semester_id];
    $this->paginate = ['conditions' => $options];

    $this->set('disciplines', $this->paginate($this->Disciplines));
    $this->set('_serialize', ['disciplines']);
}

Answer 1

您必须使用使用匹配或联接的查询才能过滤非1:1/ n-1关联.

您可以通过将查询直接传递给paginate()方法来实现

// ...
$this->set('disciplines', $this->paginate(
    $this->Disciplines
        ->find()
        ->matching('Semesters', function(\Cake\ORM\Query $q) use ($semester_id) {
            return $q->where([
                'Semesters.id' => $semester_id
            ]);
        })
        ->group(['Disciplines.id'])
));
// ...

或者使用自定义查找程序.

// ...
$this->paginate = [
    'finder' => [
        'semesters' => [
            'semester_id' => $semester_id
        ]
    ]
];
$this->set('disciplines', $this->paginate($this->Disciplines));
// ...

// DisciplinesTable
public function findSemesters(\Cake\ORM\Query $query, array $options)
{
    $query
        ->matching('Semesters', function(\Cake\ORM\Query $q) use ($options) {
            return $q->where([
                'Semesters.id' => $options['semester_id']
            ]);
        })
        ->group(['Disciplines.id']);
    return $query;
}

也可以看看

• Cookbook>分页>使用Controller :: paginate()
• Cookbook>检索数据和结果集>自定义查找器方法
• Cookbook> QueryBuilder>按关联数据过滤
• Cookbook> QueryBuilder>添加联接