Question

在Laravel上开发应用程序时，我遇到了一些困难。我想使用Event and Listener to delete并重建对象的缓存。

以下是代码：

应用\活动\ CampaignEvent.php

namespace App\Events;

use Illuminate\Queue\SerializesModels;

class CampaignEvent extends Event
{
    use SerializesModels;
    public $user_id;
    public $cache_keys;

    /**
     * Create a new event instance.
     *
     * @return void
     */
    public function __construct($user_id, $cache_keys)
    {
        $this->user_id = $user_id;
        $this->cache_keys = $cache_keys;
    }
}

应用\ Listenters \ CampaignListener.php

<?php

namespace App\Listeners;

use App\Events\CampaignEvent;
use Cache;
use Log;
use App\BrandCampaign;

class CampaignListener
{

    /**
     * Handle the event.
     *
     * @param  CampaignEvent  $event
     * @return void
     */
    public function handle(CampaignEvent $event)
    {
        /**
         * Remove cache
         */
        if(is_array($event->cache_keys)){
            foreach($event->cache_keys as $index => $cache_key){
                \Cache::forget($cache_key);
                Log::debug("[CACHE] Deleted cache for: " . $cache_key);
            }
        } else {
            \Cache::forget($event->cache_keys);
            Log::debug("[CACHE] Deleted cache for: " . $event->cache_keys);
        }

        /**
         * Rebuild cache for BrandCampaigns
         */
        $campaigns = BrandCampaign::with(['influencers' => function($query){
            $query->with(['influencer' => function($query){
                $query->select('id','profile_picture');
            }])->latest();
        }])->where('user_id', $event->user_id )->latest()->get();

        $total_influencers = [];
        foreach($campaigns as $campaign){
            foreach ($campaign->influencers as $influencer) {
                if(!in_array($influencer->influencer_id, $total_influencers))
                    $total_influencers[] = $influencer->influencer_id;
            }
        }
        $total_influencers = count($total_influencers);

        $campaigns = collect($campaigns)->toArray();

        \Cache::forever('@suppliers_campaigns('.$event->user_id.')', $campaigns);
        \Cache::put('@suppliers_total_campaigns('.$event->user_id.')', $total_influencers, 10);

        Log::debug("[CACHE] Cache rebuilt successfully!");
        return $event;
    }
}

我想缓存一个数组"forever"，但是在我的广告系列控制器中，在事件被触发后，当我从缓存中提取数据时，它返回 null

谢谢！

Answer 1

在Laravel 5（基于问题）和Laravel 7（最新）中也可以使用。

use Illuminate\Support\Facades\Cache;

// Remove cache
Cache::forget('brandCampaigns');

// Rebuild cache for BrandCampaigns. Here, when the cache key doesn't exists, the function will be called and the returned value will be stored in the cache
$campaigns = Cache::rememberForever('brandCampaigns', function () {
    return BrandCampaign::with(['influencers' => function ($query) {
        $query->with(['influencer' => function ($query) {
            $query->select('id', 'profile_picture');
        }])->latest();
    }])->where('user_id', $event->user_id)->latest()->get();
});

Laravel事件监听器和缓存无法正常工作

1 个答案: