php - 为什么这个 PHP activerecord 关联不起作用？

Question

为什么这段代码被破坏了？这应该工作，但它没有。

我有三张桌子：

applications
   id, name
subjects
   id, name
application_subjects
   application_id, subject_id, notes

这些是我的模型：

<? # Application.php
 class Application extends ActiveRecord\Model
 {
  static $has_many = array(
     array('application_subjects'),
     array('subjects', 'through' => 'application_subjects')
  );
 }
?>

<? # Subject.php
 class Subject extends ActiveRecord\Model
 {
 }
?>

<? # ApplicationSubject.php
  class ApplicationSubject extends ActiveRecord\Model
  {
    static $has_many = array(
       array("subjects")
    );
  }
?>

这是我访问模型的代码：

$app = Application::find_by_id(1); # this brings up a valid application record

foreach($app->subjects as $s) {
   echo $s->name;
}

然而，当我运行代码时，我得到：

Fatal error: Uncaught exception 'ActiveRecord\HasManyThroughAssociationException' with message 
'Could not find the association application_subjects in model Application'

Answer 1

看起来像是ApplicationSubject一个连接模型。

如果是这样，请考虑以下设置...

class Application extends ActiveRecord\Model
{
  static $has_many = array(
    array('application_subjects'),
    array('subjects', 'through' => 'application_subjects')
  );
}

class Subject extends ActiveRecord\Model
{
  static $has_many = array(
    array('application_subjects'),
    array('applications', 'through'=> 'application_subjects')
  );
}

class ApplicationSubject extends ActiveRecord\Model
{
  static $belongs_to = array(
    array('application'),
    array('subject')
  );
}