Laravel 模型：只更新一个字段

Question

我的模型有验证规则：

protected $fillable = array('username','firstname','lastname',"street","city","country","birthday","email");

public static $rules = array(
    'username' => 'required|between:4,16|unique:users',
    'email' => 'required|email|unique:users',
    'password' => 'required|min:4',
    'firstname' => 'required|alpha_num|between:2,16',
    'lastname' => 'required|alpha_num|between:2,32',
);

还有我的更新方法：

public function update($id)
{
    $user = User::find($id);        
    $data = Input::all();       
    if ( isset($data['firstname']) ) {
        $user->firstname = $data['firstname'];
    }

    $success = $user->update();

    if ( $success ) {
        return Response::json(array('error' => false, 'user' => $user->toArray()), 200 );
    } else {
        return Response::json(array('error' => true, 'message' => $user->errors()->all()), 400 );   
    }
}

现在我得到一个错误：

 {
    "error": true,
    "message": [
        "The username has already been taken.",
        "The email has already been taken."
    ]
}

那么，问题是：如何只更新模型的一个字段？

更新：

当我使用 Ardent (https://github.com/laravelbook/ardent) 时，我可以这样做：

$success = $user->updateUniques();

现在一切正常。

Answer 1

错误消息说在更新模型时，验证唯一需求检测到用户名和电子邮件已经存在。为避免这种情况，请将当前更新的 id 实例附加到 make 验证器。在验证器中使用一个参数来检测您是在更新还是创建它，并在第一种情况下发送用户ID，然后您可以使用：

强制使用唯一规则以忽略给定 ID

'username' => 'required|between:4,16|unique:users,'.$userId,
'email' => 'required|email|unique:users,'.$userId,

更多细节在这里：https://stackoverflow.com/a/22406205/1165509

Answer 2

protected function setConditionalRules($model)
{
    $id = $model->getKey();
    foreach(['email', 'username'] as $field)
    {
        $this->validator->sometimes($field, $this->rules[$field].",$id", function($input) use($model, $field)
        {
            if($model->exists)
            {
                $this->validator->setRules(array_except($this->validator->getRules(), [$field]));
                return true;
            }
            return false;
        });
    }

}