生產工單BOM以及批號完善

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);
+    }
+}