在 CakePHP 3.0 的 add 方法中将附加数据保存到 Join Table

Question

在书中的这个例子中：

https://book.cakephp.org/3.0/en/orm/associations.html#using-the-through-option

class StudentsTable extends Table
{
    public function initialize(array $config)
    {
        $this->belongsToMany('Courses', [
            'through' => 'CoursesMemberships',
        ]);
    }
}

class CoursesTable extends Table
{
    public function initialize(array $config)
    {
        $this->belongsToMany('Students', [
            'through' => 'CoursesMemberships',
        ]);
    }
}

class CoursesMembershipsTable extends Table
{
    public function initialize(array $config)
    {
        $this->belongsTo('Students');
        $this->belongsTo('Courses');
    }
}

我想在添加新的student的同时输入对应课程#8的grade。我遵循以下两个示例：

https://book.cakephp.org/3.0/en/orm/saving-data.html#saving-belongstomany-associations

和

https://book.cakephp.org/3.0/en/views/helpers/form.html#associated-form-inputs

并在StudentsController.php

中修改add方法

public function add()
    {

        $student = $this->Students->newEntity();
        if ($this->request->is('post')) {
            $student = $this->Students->patchEntity($user, $this->request->getData(), [
    'associated' => [
                'Courses']]);


            if ($this->Students->save($student,['associated' => ['Courses._joinData']])) {
                $this->Flash->success(__('The student has been saved.'));

                return $this->redirect(['action' => 'index']);
            }
            $this->Flash->error(__('The student could not be saved. Please, try again.'));
        }
        $courses = $this->Students->Courses->find('list', ['limit' => 200]);
        $this->set(compact('student', 'courses'));
        $this->set('_serialize', ['student']);
    }

和Students/add.ctp有

echo $this->Form->control('courses._ids', ['options' => $courses]);
echo $this->Form->control('courses.5._joinData.grade');

当我select课程#8在视图中输入相应的成绩时，我在CoursesMembershipstable中没有看到它。它添加了记录本身，但是 grade 不存在。

Answer 1

起初我在你的添加函数中没有看到 $course...

也许如果您将 sitems 更改为 $courses

$items = $this->Students->Courses->find('list', ['limit' => 200]);

或者在您看来：

echo $this->Form->control('courses._ids', ['options' => $items]);

Answer 2

您不能混合使用特殊的 _ids 语法和表达嵌套数据结构的传统语法，即 property.index.field...（文档中关于该行为的说明可能不会造成伤害）。

还在索引 5 处添加数据似乎非常随意，您正在添加一个新的 link/record，因此您通常会从 0.

开始

放弃 _ids 语法并通过显式定义其主键来构建适当的课程数据集，例如：

echo $this->Form->control('courses.0.id', ['type' => 'select', 'options' => $courses]);
echo $this->Form->control('courses.0._joinData.grade');

另见

在 CakePHP 3.0 的 add 方法中将附加数据保存到 Join Table

Saving Additional Data to the Join Table in the add method in CakePHP 3.0

php

mysql

jointable

cakephp-3.0