Laravel使用Observer（觀察者）實現日誌管理模塊

寫在前面：
這裏實現日誌管理寫了兩篇，第一篇是簡單的模型增刪改監聽並記錄日誌。第二篇主要介紹的是通過導入文件進行批量數據處理無法很好的被監聽處理到，這一部分的數據處理邏輯如何被記錄下來。詳細請看Laravel日誌管理記錄導入文件後的數據變化。

1、創建observer文件，我這裏是要記錄倉庫庫存模塊的操作日誌，所以執行下面的語句，會在app/Observers下面創建WarehouseInventoryObserver文件。

php artisan make:observer WarehouseInventoryObserver --model=WarehouseInventory

由於模型都是放在app/Models下面，所以要指定路徑。

php artisan make:observer WarehouseInventoryObserver --model=Models/WarehouseInventory

在App\Providers\AppServiceProvider下面開啓observer

public function boot()
    {
        WarehouseInventory::observe(WarehouseInventoryObserver::class);
    }

2、監聽該模塊下的增刪改操作，這裏使用Repository當然也可以直接使用model。created、updated、deleted分別監聽WarehouseInventory模型的新增、更新和刪除的操作。

<?php

namespace App\Observers;

use App\Models\Warehouse;
use App\Models\WarehouseInventory;
use App\Repositories\ActionLogRepository;
use Illuminate\Support\Arr;
use Illuminate\Support\Facades\Auth;

class WarehouseInventoryObserver
{
    protected $user_id;

    protected $warehouse;

    protected $actionLogRepository;

    public function __construct(
        Warehouse $warehouse,
        ActionLogRepository $actionLogRepository
    )
    {
        $this->user_id = Auth::user() ? Auth::user()->id : null;
        $this->warehouse = $warehouse->pluck('name', 'id');
        $this->actionLogRepository = $actionLogRepository;
    }

    //創建
    public function created(WarehouseInventory $warehouseInventory)
    {
        if (!empty($this->user_id)) {
            $attributes = $warehouseInventory->getAttributes();
            $attributes = Arr::only($attributes, ['warehouse_id', 'seller_sku', 'quantity', 'box']);
            $warehouse = $this->warehouse->get($attributes['warehouse_id']);
            //拼接數據
            $data = [
                'module' => 'warehouse_inventory',
                'user_id' => $this->user_id,
                'type' => 'create',
                'content' => [
                    'warehouse' => $warehouse,
                    'seller_sku' => $attributes['seller_sku'],
                    'original_quantity' => 0,
                    'current_quantity' => $attributes['quantity'],
                    'box' => $attributes['box']
                ]
            ];

            $this->actionLogRepository->makeModel()->create($data);
        }
    }

    //更新
    public function updated(WarehouseInventory $warehouseInventory)
    {
        if (!empty($this->user_id)) {
            $original = $warehouseInventory->getOriginal();
            $dirty = $warehouseInventory->getDirty();
            $dirty = Arr::except($dirty, ['remark', 'updated_at']);
            if (count($dirty)) {
                if (Arr::has($dirty, 'warehouse_id')) {
                    $warehouse = $this->warehouse->get($dirty['warehouse_id']);
                } else {
                    $warehouse = $this->warehouse->get($original['warehouse_id']);
                }
                //拼接數據
                $data = [
                    'module' => 'warehouse_inventory',
                    'user_id' => $this->user_id,
                    'type' => 'update',
                    'content' => [
                        'warehouse' => $warehouse,
                        'seller_sku' => $original['seller_sku'],
                        'original_quantity' => $original['quantity'],
                        'current_quantity' => $dirty['quantity'],
                        'box' => (Arr::has($dirty, 'box')) ? $dirty['box'] : $original['box']
                    ]
                ];

                $this->actionLogRepository->makeModel()->create($data);
            }
        }
    }

    //刪除
    public function deleted(WarehouseInventory $warehouseInventory)
    {
        if (!empty($this->user_id)) {

            $original = $warehouseInventory->getOriginal();
            $warehouse = $this->warehouse->get($original['warehouse_id']);
            //拼接數據
            $data = [
                'module' => 'warehouse_inventory',
                'user_id' => $this->user_id,
                'type' => 'delete',
                'content' => [
                    'warehouse' => $warehouse,
                    'seller_sku' => $original['seller_sku'],
                    'original_quantity' => $original['quantity'],
                    'current_quantity' => 0,
                    'box' => $original['box']
                ]
            ];

            $this->actionLogRepository->makeModel()->create($data);
        }
    }
}

3、數據庫