用户端跨城订单界面优化

server/dukang-api/src/modules/trade/trade.service.ts

@@ -75,7 +75,6 @@ export class TradeService {
       city.localMinQty,
       city.crossMinQty,
     );
-    if (!check.ok) throw new BadRequestException(check.message);
 
     const unitPrice = Number(product.price);
     const productAmount = unitPrice * body.quantity;
@@ -96,6 +95,10 @@ export class TradeService {
       payAmount: productAmount,
       benefitAmount: benefitPerUnit * body.quantity,
       city: serializeBigInt(city),
+      /** 起购未满足时仍返回预览，供确认页改数量；下单接口仍会硬校验 */
+      quantityOk: check.ok,
+      quantityMessage: check.ok ? null : (check.message ?? null),
+      minQty: deliveryType === 'LOCAL' ? city.localMinQty : city.crossMinQty,
     };
   }
 
@@ -110,6 +113,9 @@ export class TradeService {
     req: Request,
   ) {
     const preview = await this.preview(userId, body);
+    if (preview.quantityOk === false) {
+      throw new BadRequestException(preview.quantityMessage || '购买数量不满足起购要求');
+    }
     const address = await this.prisma.userAddress.findFirst({
       where: { id: BigInt(body.addressId), userId },
     });