Kohana的ORM的关系问题

Question

我有表：

 
users {id, name} 
projects {id, name} 
roles {id, name} 
projects_users {id, user_id, project_id, role_id} 

我已经型号：

 
project { has many users through projects_users } 
user { has many projects through projects_users } 

问题： 如何到用户角色的一个项目？或者，也许我必须重建我的表？

代码：

 
$project = ORM::factory('project', $id); 
$users = $project->users->find_all(); 
foreach ($users as $u) { 
    $roles = $u-> .... How to get all roles for this user and for this project? 
} 

Answer 1

你project_users表似乎表示对项目的角色，添加绑定在该表的另一种模式：

project_role { 
    has one user 
    has one role 
    has one project 
} 
user { 
    has many project_role 
    ... 
} 
project { 
    has many project_role 
    ... 
} 

这时，你可能能够做到：

$user = ORM::factory('user') 
    ->with('project_role') 
    ->where('project_role.project_id', '=', $id) 
    ->with('project_role:role')->findall(); 

如果这样不起作用，下列其中一项应该可行，但可能是不同的形式o f遍历你所追求的东西。

$project = ORM::factory('project', $id); 
$roles = $project->project_role->with('user')->with('role')->findall(); 

或者

$roles = ORM::factory('project_role') 
    ->where('project_id', '=', $id) 
    ->with('user')->with('role')->findall();