Laravel有很多人通过另一个模型

Question

我有这3张桌子。我想获得创建客户端的员工姓名

我试过这个

class LeadsModel extends Eloquent
public function researcher_name()
{
    $user = $this->belongsTo('users','id','user_id');
    return $user->getResults()->belongsTo('employees','id','employee_id');
}

但它返回错误：

"message":"SQLSTATE[42S22]: Column not found: 1054 Unknown column 'employees.employee_id' in 'where clause' (SQL: select * from `employees` where `employees`.`employee_id` in (4))"}}

当我切换id和employee_id时，它不会为用户和员工返回任何关系。

基本上，我需要让客户拥有创建它的员工姓名。

Answer 1

假设关系：

Client belongsTo User
User belongsTo Employee

简单地称之为：

$client->user->employee;

---

根据您的架构，以下是为了获得与Employee相关的Client所需的关系（通过User）：

// Client model
public function user()
{
 return $this->belongsTo('User');
}

// User model
public function employee()
{
 return $this->belongsTo('Employee');
}

然后简单地称之为：

$client = Client::find($someId);
$client->user; // single user related to the client
$client->user->employee; // single employee related to the user

您可能想要先检查给定的关系是否存在：

// just an example, don't write it this way ;)
if ($client->user) { // user is not null
  if ($client->user->employee) { // employee is not null as well
    $client->user->employee->name; // name = field on the employees table
  }
}

Answer 2

您需要Has Many Through关系。

在员工的模型中添加名为clients的关系：

public function clients()
{
    return $this->hasManyThrough('App\Client', 'App\User');
}

然后你可以像下面这样使用它：

Employee::first()->clients()->get();