fix edit products using new workflow mutations

app/Models/Dealer.php

@@ -41,4 +41,11 @@ class Dealer extends Model
     {
         return $this->hasMany(Stock::class);
     }
+
+    public function products()
+    {
+        return $this->belongsToMany(Product::class, 'stocks', 'dealer_id', 'product_id')
+                    ->withPivot('quantity')
+                    ->withTimestamps();
+    }
 }