Question

在此示例中，如何在模型中创建“分配到教师”关系？

assignments           subjects              teachers
---------             ---------             ------
id                    id                    id
student_id            subject_name          teacher_name
subject_id            teacher_id

我想要一个SQL查询，显示：assignment_id，student_id，subject_name，teacher_name。我使用“belongsTo”来创建“作业与作业”的关系，但我不确定如何创建“作业与教师”。

AssignmentsController.php

public function index() {
    $this->set('assignments', $this->Assignment->find('all'));
}

--------------------------
Assignment.php

public $belongsTo = array(
    'Subject'
);

我确实通过在控制器中向“find（'all'）”添加连接来实现此功能，但我想知道如何在模型中执行此操作。

AssignmentsController.php 
//(working, but looking to solve this in models, not controller)

$this->set('assignments', $this->Assignment->find('all', array(
        'joins' => array(
            array(
                'table' => 'subjects',
                'alias' => 'Subject',
                'type' => 'LEFT',
                'conditions' => 'Assignment.subject_id = Subject.id'
            ),
            array(
                'table' => 'teachers',
                'alias' => 'Teacher',
                'type' => 'LEFT',
                'conditions' => 'Subject.teacher_id = Teacher.id'
            )
        ),
        'fields' => array('*','Subject.subject_name', 'Teacher.teacher_name')
    )));

Answer 1

据我所知，assignments与teachers到subjects有关，对吧？然后，在Subject模型：

public $belongsTo = array('Teacher');

此外，在AppModel上，使用Containable行为：

public $actsAs = array('Containable');

现在，您可以通过以下方式查找assignment：

$this->Assignment->find('all', array(
    'fields' => array('id', 'student_id')
    'contain' => array(
        'Subject' => array(
            'fields' => array('id', 'subject_name')
            'Teacher' => array(
                'fields' => array('id', 'teacher_name')
            )
        )
    )
));

Containable行为可让您通过相关模型进行深入搜索

CakePHP中的模型链接

1 个答案: