fallback handled

app/Http/Controllers/Admin/ProductController.php

@@ -460,6 +460,12 @@ class ProductController extends SuperController
             $data['use_last_price_if_zero'] = !empty($data['use_last_price_if_zero']);
         }
 
+        if (!Product::hasTradeByQuantityColumn()) {
+            unset($data['trade_by_quantity']);
+        } elseif (array_key_exists('trade_by_quantity', $data)) {
+            $data['trade_by_quantity'] = !empty($data['trade_by_quantity']);
+        }
+
         if (!Product::hasDirectPriceColumn()) {
             unset($data['direct_price']);
         }

app/Http/Controllers/Controller.php

@@ -451,6 +451,16 @@ class Controller extends BaseController
         return (float) $product['amount'] > 0;
     }
 
+    /** معامله مقداری: فقط فیلد trade_by_quantity */
+    public static function usesQuantityTrade($product): bool
+    {
+        $value = is_array($product)
+            ? ($product['trade_by_quantity'] ?? null)
+            : (is_object($product) ? ($product->trade_by_quantity ?? null) : null);
+
+        return !empty($value);
+    }
+
     /** ضریب قیمت محصول — بدون وزن قطعه همیشه ۱ */
     public static function productPriceMultiplier($product): float
     {

app/Models/Product.php

@@ -21,6 +21,7 @@ class Product extends Model
     private static ?bool $showInAssetsColumnExists = null;
     private static ?bool $useLastPriceIfZeroColumnExists = null;
     private static ?bool $directPriceColumnExists = null;
+    private static ?bool $tradeByQuantityColumnExists = null;
 
     protected static function booted(): void
     {
@@ -44,6 +45,9 @@ class Product extends Model
             if (!static::hasDirectPriceColumn()) {
                 unset($product->attributes['direct_price']);
             }
+            if (!static::hasTradeByQuantityColumn()) {
+                unset($product->attributes['trade_by_quantity']);
+            }
         });
     }
 
@@ -153,6 +157,24 @@ class Product extends Model
         return static::$directPriceColumnExists;
     }
 
+    public static function hasTradeByQuantityColumn(): bool
+    {
+        if (static::$tradeByQuantityColumnExists !== null) {
+            return static::$tradeByQuantityColumnExists;
+        }
+
+        try {
+            static::$tradeByQuantityColumnExists = Schema::hasColumn(
+                (new static)->getTable(),
+                'trade_by_quantity'
+            );
+        } catch (\Throwable) {
+            static::$tradeByQuantityColumnExists = false;
+        }
+
+        return static::$tradeByQuantityColumnExists;
+    }
+
     public function orderLimitsEnabled(): bool
     {
         if (!static::hasOrderLimitColumns() || !($this->order_limit_enabled ?? false)) {
@@ -204,6 +226,7 @@ class Product extends Model
         'for_barayand',      // Whether it is for Barayand (boolean).
         'show',              // Whether to show the record (boolean).
         'show_in_assets',    // Show balance on customer assets page cards
+        'trade_by_quantity', // UI معامله مقداری: ارزش کل + مقدار
         'use_last_price_if_zero', // Keep last DB price when automatic provider returns zero
         'open_sell',         // Whether selling is open (boolean).
         'auto_open_at',         // Whether selling is open (boolean).
@@ -230,6 +253,7 @@ class Product extends Model
 
     protected $attributes = [
         'show_in_assets' => false,
+        'trade_by_quantity' => false,
         'use_last_price_if_zero' => false,
     ];
 
@@ -238,6 +262,7 @@ class Product extends Model
         'active' => 'boolean',        // Cast to boolean.
         'show' => 'boolean',          // Cast to boolean.
         'show_in_assets' => 'boolean',
+        'trade_by_quantity' => 'boolean',
         'use_last_price_if_zero' => 'boolean',
         'for_barayand' => 'boolean',  // Cast to boolean.
         'open_sell' => 'boolean',     // Cast to boolean.