生產工單BOM以及批號完善

app/Models/Inventory.php

@@ -9,13 +9,13 @@ class Inventory extends Model
 {
     /** @use HasFactory<\Database\Factories\InventoryFactory> */
     use HasFactory;
+    use \Illuminate\Database\Eloquent\SoftDeletes;
     use \Spatie\Activitylog\Traits\LogsActivity;
 
     protected $fillable = [
         'warehouse_id',
         'product_id',
         'quantity',
-        'safety_stock',
         'location',
         // 批號追溯欄位
         'batch_number',
@@ -121,7 +121,9 @@ class Inventory extends Model
         $dateFormatted = date('Ymd', strtotime($arrivalDate));
         $prefix = "{$productCode}-{$originCountry}-{$dateFormatted}-";
 
-        $lastBatch = static::where('batch_number', 'like', "{$prefix}%")
+        // 加入 withTrashed() 確保流水號不會撞到已刪除的紀錄
+        $lastBatch = static::withTrashed()
+            ->where('batch_number', 'like', "{$prefix}%")
             ->orderByDesc('batch_number')
             ->first();
 

app/Models/WarehouseProductSafetyStock.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * 倉庫-商品安全庫存設定
+ * 每個倉庫-商品組合只有一筆安全庫存設定
+ */
+class WarehouseProductSafetyStock extends Model
+{
+    protected $table = 'warehouse_product_safety_stocks';
+
+    protected $fillable = [
+        'warehouse_id',
+        'product_id',
+        'safety_stock',
+    ];
+
+    protected $casts = [
+        'safety_stock' => 'decimal:2',
+    ];
+
+    /**
+     * 所屬倉庫
+     */
+    public function warehouse(): BelongsTo
+    {
+        return $this->belongsTo(Warehouse::class);
+    }
+
+    /**
+     * 所屬商品
+     */
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(Product::class);
+    }
+}