如何使用 Laravel 4 Eloquent 连接列？

我有一张桌子叫tenantdetails其中包含

Tenant_Id | First_Name | Last_Name | ........

我想找回First_Name and Last Name通过 MySQL 的串联功能作为一列。所以我写在我的controller如下

$tenants = Tenant::orderBy('First_Name')->lists('CONCAT(`First_Name`," ",`Last_Name`)','Tenant_Id');

但结果出现以下错误：

 SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error 
 in your SQL syntax; check the manual that corresponds to your MySQL server
 version for the right syntax to use near '`," ",`First_Name`)`, 
 `Id` from `tenantdetails` order by `F' at line 1 

 (SQL: select `CONCAT(`First_Name`," ",`Last_Name`)`, `Id` 
 from `tenantdetails` order by `First_Name` asc).

在 Laravel Eloquent 中调用 MySQL 函数时如何避免反引号。我只对 Eloquent 感兴趣（对流畅的查询不感兴趣）。提前致谢。

Update

感谢@Andreyco 帮助我。我们可以使用 Laravel 模型以更优雅的方式实现这一点，如下所示：

In our model:

public function getTenantFullNameAttribute()
{
    return $this->attributes['First_Name'] .' '. $this->attributes['Last_Name'];
}

并在我们的controller:

$tenants = Tenant::orderBy('First_Name')->get();
$tenants = $tenants->lists('TenantFullName', 'Tenant_Id');

Tenant::select('Tenant_Id', DB::raw('CONCAT(First_Name, " ", Last_Name) AS full_name'))
    ->orderBy('First_Name')
    ->lists('full_name', 'Tenant_Id');