feat: update sales query to use cart quantity when purchase items are absent and enhance related tests

app/Domains/Sale/Services/AdminAppSaleService.php

@@ -151,7 +151,8 @@ class AdminAppSaleService
                 $filters['status'] ?? null,
                 fn (Builder $query, string $status): Builder => $query->where('status', $status)
             )
-            ->withSum('items as quantity', 'cantidad')
+            ->select('compras.*')
+            ->selectRaw($this->quantityExpression())
             ->withCount('tickets')
             ->orderBy($sortColumns[$sortBy], $sortDirection)
             ->when($sortBy !== 'id', fn (Builder $query): Builder => $query->orderByDesc('id'));
@@ -177,8 +178,26 @@ class AdminAppSaleService
 
     protected function saleForResponse(Purchase $sale): Purchase
     {
-        return $sale->refresh()
-            ->loadSum('items as quantity', 'cantidad')
-            ->loadCount('tickets');
+        /** @var Purchase */
+        return Purchase::query()
+            ->select('compras.*')
+            ->selectRaw($this->quantityExpression())
+            ->withCount('tickets')
+            ->findOrFail($sale->getKey());
+    }
+
+    protected function quantityExpression(): string
+    {
+        return <<<'SQL'
+            COALESCE(
+                (SELECT SUM(compra_items.cantidad)
+                 FROM compra_items
+                 WHERE compra_items.compra_id = compras.id),
+                (SELECT SUM(carrito_items.cantidad)
+                 FROM carrito_items
+                 WHERE carrito_items.cart_id = compras.cart_id),
+                0
+            ) AS quantity
+            SQL;
     }
 }