Laravel:为历史记录保存我的模型的序列化副本

Question

我需要管理特定模型的记录历史。按照下面的示例(https://laravel.com/docs/5.2/eloquent#events)，我在AppServiceProvider.php文件中做了这样的操作:

use AppSourceModel;
use AppHistory;
use IlluminateSupportFacadesAuth;
use IlluminateSupportServiceProvider;
class AppServiceProvider extends ServiceProvider {
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        SourceModel::saving(function ($source) {
            $his= new History();
            $his->record = $source->toJson();
            $his->user_id = Auth::User()->id;
            $his->saved_id = $source->id;
            $his->saved_type = 'AppSourceModel';
            $his->save();
        });
    }
...

问题是这样的Auth::User()返回NULL…

我该如何解决这个问题?是否有办法使Auth在appserviceprovider工作，或者我应该把我的保存事件移动到其他地方?

Answer 1

因为这个闭包是在模型保存时调用的，所以假设存在一个经过身份验证的用户，我希望它能够工作。

我可以确认使用tinker:

>>> AppUser::saving(function ($user) { echo "AUTH USER ID: " . Auth::user()->id; });
=> null
>>> Auth::login(AppUser::find(1));
=> null
>>> AppUser::find(1)->save();
AUTH USER ID: 1⏎
=> true

因此，我会说如果Auth::user()返回null，则该模型在没有经过身份验证的用户的情况下保存，如果发生这种情况，则需要添加检查:

    SourceModel::saving(function ($source) {
        $his= new History();
        $his->record = $source->toJson();
        $his->user_id = (Auth::check()) ? Auth::User()->id : 0;
        $his->saved_id = $source->id;
        $his->saved_type = 'AppSourceModel';
        $his->save();
    });

Answer 2

我认为正确的地方听模型事件是EventServiceProvider (AppProvidersEventServiceProvider)。

只要把你的代码移动到EventServiceProvider中的"boot"方法，你就完成了。

<?php
namespace AppProviders;
use IlluminateFoundationSupportProvidersEventServiceProvider as ServiceProvider;
use IlluminateSupportFacadesEvent;
use AppSourceModel;
use AppHistory;
use IlluminateSupportFacadesAuth;
class EventServiceProvider extends ServiceProvider
{
    /**
     * The event listener mappings for the application.
     *
     * @var array
     */
    protected $listen = [
        'AppEventsSomeEvent' => [
            'AppListenersEventListener',
        ],
    ];
    /**
     * Register any events for your application.
     *
     * @return void
     */
    public function boot()
    {
        parent::boot();
        //
        SourceModel::saving(function ($source) {
            $his= new History();
            $his->record = $source->toJson();
            $his->user_id = Auth::User()->id;
            $his->saved_id = $source->id;
            $his->saved_type = 'AppSourceModel';
            $his->save();
        });
    }
}

注意:你可以像这样包含facade: "use Auth"