Laravel在保存或更新数据时返回null - Laravel return null when data save or update

我使用这个代码部分多次没有问题。但这一次$success返回null，我不能弄清楚。当我检查数据库时，我看到用户1被更新了。因为它是保存的，所以没有可填充的问题。我也试过save()函数。我错过了什么?谢谢你的帮助。

(Laravel version 5.2.45)

$user = User::find(1);
$user->firstname = $request->firstname;
$user->lastname = $request->lastname;
$success= $user->update(); // Database update is successful
dd($success); // But return null

用户模型

<?php
namespace App;
use App'Presenters'UserPresenter;
use App'Services'Logging'UserActivity'Activity;
use App'Support'Authorization'AuthorizationUserTrait;
use App'Support'Enum'UserStatus;
use Illuminate'Database'Eloquent'Model;
use Illuminate'Auth'Passwords'CanResetPassword;
use Illuminate'Contracts'Auth'Authenticatable as AuthenticatableContract;
use Illuminate'Contracts'Auth'Access'Authorizable as AuthorizableContract;
use Illuminate'Contracts'Auth'CanResetPassword as CanResetPasswordContract;
use Zizaco'Entrust'Traits'EntrustUserTrait;
class User extends Model implements AuthenticatableContract, AuthorizableContract, CanResetPasswordContract
{
use CanResetPassword, AuthorizationUserTrait;
/**
 * The database table used by the model.
 *
 * @var string
 */
protected $table = 'users';
protected $dates = ['last_login', 'birthday'];
/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $guarded = [];
/**
 * The attributes excluded from the model's JSON form.
 *
 * @var array
 */
protected $hidden = ['password', 'remember_token'];
public function items()
{
    return $this->hasMany('App'Item');
}
/**
 * Always encrypt password when it is updated.
 *
 * @param $value
 * @return string
 */
public function setPasswordAttribute($value)
{
    $this->attributes['password'] = bcrypt($value);
}
public function gravatar()
{
    $hash = hash('md5', strtolower(trim($this->attributes['email'])));
    return sprintf("//www.gravatar.com/avatar/%s", $hash);
}
public function isUnconfirmed()
{
    return $this->status == UserStatus::UNCONFIRMED;
}
public function isActive()
{
    return $this->status == UserStatus::ACTIVE;
}
public function isBanned()
{
    return $this->status == UserStatus::BANNED;
}
public function city()
{
    return $this->belongsTo(City::class, 'city_id');
}
public function activities()
{
    return $this->hasMany(Activity::class, 'user_id');
}
public function getRememberToken()
{
    return $this->remember_token;
}
public function setRememberToken($value)
{
    $this->remember_token = $value;
}
public function getRememberTokenName()
{
    return 'remember_token';
}
public function getAuthIdentifier()
{
    return $this->getKey();
}
public function getAuthpassword()
{
    return $this->password;
}
public function getAuthIdentifierName()
{
    return $this->getKeyName();
}
public function verification()
{
    return $this->hasOne('App'Verification');
}
}

更新问题(New Try):

我尝试了只更新功能的空控制器。我还是失败了。

UserController.php

<?php
namespace App'Http'Controllers;
use App'User;
use Auth;
use Illuminate'Http'Request;
class UserController extends Controller
{
public function getEdit()
{
    $user = User::find(1);
    return view('user.editprofile', compact('user'));
}
public function postEdit(Request $request)
{
    $user = User::find(1);
    $user->firstname = $request->firstname;
    $user->lastname = $request->lastname;
    if($user->update())
    {
        echo "Success";
    }
    echo "Fail"; // Print "Fail" but update was successful.
}
}

当成功插入或更新记录时，laravel成功返回true，失败返回false，您也可以这样检查。

 if($user->save()){
     //do something when user is save 
 }else{
     // do something wehn user is not update
 }

或

if($user->update()){
     //do something when user is update 
 }else{
     // do something wehn user is not update
 }

我通常这样做是为了确保成功保存

try {
    DB::beginTransaction();
    // save or update happen in here
    DB::commit();
} catch ('Exception $e) {
    DB::rollback();
    // something happen in here when error
}

DB::beginTransaction();
DB::commit();
DB::rollback();

是可选的，但我建议使用它，因为当中间发生错误时，它会为您回滚保存的数据。

尝试使用数组更新用户。这样的

$user = User::find(1);
$dataToUpdate['firstname'] = $request->firstname;
$dataToUpdate['lastname'] = $request->lastname;
if($user->update($dataToUpdate))
{
    echo "Success";
}
echo "Fail"; // Print "Fail" but update was successful.

也可以尝试添加:

protected $fillable = ['firstname', 'lastname'];

到你的User.php模型

我把问题弄明白了。有一个trait覆盖了保存和更新功能。

use App'Support'Authorization'AuthorizationUserTrait