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## 观察者 路径:app/Observers 示例: **定义观察者** app/Observers/BlockObserver.php ```php namespace App\Observers; use App\Models\Block; use Illuminate\Support\Facades\Auth; // creating, created, updating, updated, saving, // saved, deleting, deleted, restoring, restored /** * 区块观察者 * * Class BlockObserver * @package Wanglelecc\Laracms\Observers */ class BlockObserver { public function creating(Block $block) { $block->object_id || $block->object_id = create_object_id(); $block->created_op || $block->created_op = Auth::id(); $block->updated_op || $block->updated_op = Auth::id(); } public function updating(Block $block) { $block->updated_op = Auth::id(); } public function updated(Block $block){ Block::clearCache($block->object_id); } public function saving(Block $block){ if(is_array($block->content) || is_object($block->content)){ $block->content = json_encode($block->content, JSON_UNESCAPED_UNICODE); } } } ``` > 可通过 Laravel 提供的 `php artisan make:observer` 自动生成 **注册观察者** 在 `AppServiceProvider` 服务提供者的 boot 方法中: ```php . . . public function boot(){ \App\Models\Block::observe(\App\Observers\BlockObserver::class); } . . . ```