partial update create mutations

app/Models/Product.php

@@ -24,9 +24,20 @@ class Product extends Model
         return $this->hasMany(Stock::class);
     }
 
+    public function mutationDetails()
+    {
+        return $this->hasMany(MutationDetail::class);
+    }
+
     // Helper method untuk mendapatkan total stock saat ini
     public function getCurrentTotalStockAttribute()
     {
         return $this->stocks()->sum('quantity');
     }
+
+    // Helper method untuk mendapatkan stock di dealer tertentu
+    public function getStockByDealer($dealerId)
+    {
+        return $this->stocks()->where('dealer_id', $dealerId)->first()?->quantity ?? 0;
+    }
 }