PHP-activerecord - 关系has_many（users，groups，users_groups）

Question

我想在我看来这样做，但它不起作用：

<?php echo $user->group->name;?>

我有3张桌子

- users (id, name)
- groups (id, name)
- users_groups (id, user_id, group_id)

我有2个模特

class User extends ActiveRecord\Model
{
    static $belongs_to = array(
        array('group', 'through' => 'users_groups')
    );
}

class Group extends ActiveRecord\Model
{
    static $has_many = array(
        array('users' , 'through' => 'users_groups')
    );
}

我的模特错了或错过了什么？我需要另一个模型users_groups？如果是，那怎么称呼？

我需要帮助，我找不到正确的方法。

谢谢！

Answer 1

解决方案是：

class User extends ActiveRecord\Model
{
    static $has_many = array(
    array('groups', 'through' => 'usersgroups', 'order'=>'id asc'),
        array('usersgroups')
    );
}


class Group extends ActiveRecord\Model 
{
    static $has_many = array(
        array('users' , 'through' => 'usersgroups'),
        array('usersgroups')
    );
}

class UsersGroup extends ActiveRecord\Model
{
    static $table_name = 'users_groups';

    static $belongs_to = array(
        array('user'),
        array('group')
    );
}

问题在于第三个模型的名称（UsersGroup in singular）

Answer 2

class User extends ActiveRecord\Model
{
    function get_group($user_id){
        $query = "SELECT name FROM groups 
                  LEFT JOIN users_groups ON (groups.id=users_groups.group_id)
                  LEFT JOIN users ON (users_groups.user_id=users.id)";
        $this->group = mysql_fetch_object($query);
    }
}

将此功能添加到您的用户功能

Answer 3

我认为你问题的答案在manual。这是您尝试实现的多对多关联的示例。在这种情况下，组是订单，users_groups是付款。

 class Order extends ActiveRecord\Model {
   static $has_many = array(
     array('payments'),
     array('users', 'through' => 'payments')
   );
 }

 class Payment extends ActiveRecord\Model {
   static $belongs_to = array(
     array('user'),
     array('order')
   );
 }

 class User extends ActiveRecord\Model {
   static $has_many = array(
    array('payments')
   );
 }

 $order = Order::first();
 # direct access to users
 print_r($order->users); # will print an array of User object