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HomeBackend DevelopmentPHP Tutorial10.Laravel5学习笔记:Laravel中的批量赋值探索

问题描述

在使用laravel的 seed 功能的时候,经常有同学会看到以下这个异常

[Illuminate\Database\Eloquent\MassAssignmentException]
username

这个异常是什么呢?意思就是,使用MODEL::create()这个方法的时候,Laravel为了保证系统的安全,防止有人恶意通过http请求来直接将某些字段创建时插入到数据库,造成破坏。

引用官网的原话

A mass-assignment vulnerability occurs when user’s pass unexpected HTTP parameters through a request, and then that parameter changes a column in your database you did not expect. For example, a malicious user might send an is_admin parameter through an HTTP request, which is then mapped onto your model’s create method, allowing the user to escalate themselves to an administrator.

正确使用

首先假设我们的 Seeder 是这样的

    public function run() {        DB::table('addresss')->delete();        Address::create([            'user_id' => 1,            'identity' => 1,            'longlat' => 'XXXXX',            'province' => 'XXX',            'city' => 'XXX',            'district' => 'XXX',            'detail' => 'XXXX',        ]);    }

此时如果 Address 这个model没有设置 fillable 或者 guarded 两个属性,而直接使用
php artisan db:seed --class="AddressTableSeeder" 的话,就会报上面的错误。假设在 Address 中设置了 fillable

protected $fillable = ['user_id', 'identity', ];

此时如果执行 seed 命令,数据库中新增加的数据只会有 user_id 与 identity 这两个字段。

通过以上这个过程可以明确了解到批量赋值的深意了吧。所以想要在创建的时候完成所有数据的插入,应该将所有的字段均设置到 fillable 中去。

字段太多怎么办

偶尔也会遇到一张表中的字段太多了,有同学说一个个写到 fillable 中是不是太蛋碎了呀。Laravel这款号称史上最优雅的框架,怎么可能没有考虑到这个事情呢。所有还有一个 guarded 这个属性供你使用嘛。字段太多的时候,你把需要禁止批量赋值的字段设置到它里边就好了。

学海无涯呀!继续加油推进,最近开始使用laravel在做app的后端服务了。已经分享了一些自己结合第三方SDK改造的工具。

  • 百度消息推送 Laravel composer包
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