feat: Introduce FeedDeliveryObserver for automatic feed stock management and enhance ProcessFeedSchedule with stock pre-checks and transactions.

app/Console/Commands/ProcessFeedSchedule.php

@@ -5,6 +5,7 @@
 use App\Models\FeedDelivery;
 use App\Models\FeedSchedule;
 use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
 
 class ProcessFeedSchedule extends Command
 {
@@ -21,7 +22,7 @@ public function handle(): int
     {
         $time = $this->argument('time') ?? now()->format('H:i');
 
-        $schedules = FeedSchedule::whereTime('scheduled_at', $time)->get();
+        $schedules = FeedSchedule::with('feeds.unit')->whereTime('scheduled_at', $time)->get();
 
         if ($schedules->isEmpty()) {
             $this->info("No schedules found for time: {$time}");
@@ -31,15 +32,27 @@ public function handle(): int
 
         foreach ($schedules as $schedule) {
             foreach ($schedule->feeds as $feed) {
-                $quantity = $feed->pivot->quantity;
+                if ($feed->stock < $feed->pivot->quantity) {
-                $decrement = min($quantity, $feed->stock);
+                    $this->error("Stock pakan '{$feed->name}' tidak cukup untuk jadwal '{$schedule->scheduled_at->format('H:i')}'. Dibutuhkan: {$feed->pivot->quantity}, Tersedia: {$feed->stock}");
-                $feed->decrement('stock', $decrement);
 
-                FeedDelivery::create([
+                    return 1;
-                    'feed_id' => $feed->id,
+                }
-                    'quantity' => $quantity,
+            }
-                    'delivered_at' => now(),
+
-                ]);
+            try {
+                DB::transaction(function () use ($schedule) {
+                    foreach ($schedule->feeds as $feed) {
+                        FeedDelivery::create([
+                            'feed_id' => $feed->id,
+                            'quantity' => $feed->pivot->quantity,
+                            'delivered_at' => now(),
+                        ]);
+                    }
+                });
+            } catch (\Exception $e) {
+                $this->error('Gagal memproses jadwal pakan: '.$e->getMessage());
+
+                return 1;
             }
         }
 

app/Models/FeedDelivery.php

@@ -2,11 +2,14 @@
 
 namespace App\Models;
 
+use App\Observers\FeedDeliveryObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
+#[ObservedBy([FeedDeliveryObserver::class])]
 class FeedDelivery extends Model
 {
     use HasFactory, SoftDeletes;

app/Observers/FeedDeliveryObserver.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\FeedDelivery;
+use Illuminate\Support\Facades\DB;
+
+class FeedDeliveryObserver
+{
+    /**
+     * Handle the FeedDelivery "created" event.
+     */
+    public function created(FeedDelivery $feedDelivery): void
+    {
+        $feedDelivery->feed()->decrement('stock', $feedDelivery->quantity);
+    }
+
+    /**
+     * Handle the FeedDelivery "updating" event.
+     */
+    public function updating(FeedDelivery $feedDelivery): void
+    {
+        if ($feedDelivery->isDirty('quantity')) {
+            $oldQuantity = $feedDelivery->getOriginal('quantity');
+            $newQuantity = $feedDelivery->quantity;
+
+            $diff = $newQuantity - $oldQuantity;
+
+            $feedDelivery->feed()->decrement('stock', $diff);
+        }
+
+        if ($feedDelivery->isDirty('feed_id')) {
+            $oldFeedId = $feedDelivery->getOriginal('feed_id');
+            $newFeedId = $feedDelivery->feed_id;
+
+            DB::table('feeds')->where('id', $oldFeedId)->increment('stock', $feedDelivery->getOriginal('quantity'));
+
+            DB::table('feeds')->where('id', $newFeedId)->decrement('stock', $feedDelivery->quantity);
+        }
+    }
+
+    /**
+     * Handle the FeedDelivery "deleted" event.
+     */
+    public function deleted(FeedDelivery $feedDelivery): void
+    {
+        $feedDelivery->feed()->increment('stock', $feedDelivery->quantity);
+    }
+
+    /**
+     * Handle the FeedDelivery "restored" event.
+     */
+    public function restored(FeedDelivery $feedDelivery): void
+    {
+        $feedDelivery->feed()->decrement('stock', $feedDelivery->quantity);
+    }
+}