Laravel：一个表的多个模型

我的目标：在表中维护所有用户（代理、管理员、学生、教师或更多角色），但每个模型/角色都能够根据其角色引用同一表上的另一个id

$admins=Agent:：with（'Agent'）->get（）

注意：我已经有了表
角色
和
用户角色
，它们工作正常

users
===========
id
username
password
fullname

agent_student (one agent has many students but one student belongsTo one agent)
===========
id 
agent_id
student_id

admin_agent (one admin has many agents but one agent belongsTo one admin)
===========
id
admin_id
agent_id

app/Agent.php：

namespace App;

use Illuminate\Database\Eloquent\Model;

class Agent extends User
{
    protected $table = 'users';

    public function student()
    {
        return $this->hasMany('App\Student', 'id');
    }

    function agent_student()
    {
        return $this->hasMany('App\AgentStudent', 'id');
    }
}

app/Student.php：

namespace App;

use Illuminate\Database\Eloquent\Model;

class Student extends User
{
    protected $table = 'users';

    public function agent()
    {
        return $this->belongsTo('App\Agent', 'id');
    }

    public function agent_student()
    {
        return $this->hasOne('App\AgentStudent', 'student_id');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class UserStudent extends Model
{
    protected $table = 'user_student';

    function student()
    {
        return $this->hasOne('App\Student', 'id');
    }

    function agent()
    {
        return $this->belongsTo('App\Agent', 'id');
    }
}

app/AgentStudent.php：

namespace App;

use Illuminate\Database\Eloquent\Model;

class Student extends User
{
    protected $table = 'users';

    public function agent()
    {
        return $this->belongsTo('App\Agent', 'id');
    }

    public function agent_student()
    {
        return $this->hasOne('App\AgentStudent', 'student_id');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class UserStudent extends Model
{
    protected $table = 'user_student';

    function student()
    {
        return $this->hasOne('App\Student', 'id');
    }

    function agent()
    {
        return $this->belongsTo('App\Agent', 'id');
    }
}

你为什么不把它作为自我介绍呢

class Agent extends Eloquent {

public function parent()
{
    return $this->belongsTo('App\Agent', 'parent_id');
}

public function children()
{
    return $this->hasMany('App\Agent', 'parent_id');
}
}

我看不出你有什么问题。你的问题是格式错误的示例代理（1，2）学生id（3，4，5，6）代理（1=>3，1=>4，2=>5，2=>6）（用户id 3和4属于用户id 1…..用户id 5和6属于用户id 2）如果我从控制器调用student:：find（3）->with（'agent'）->get（）；我希望它返回用户id 1而不是用户id 3