该商品不支持跨城配送，请更换为开城城市内的收货地址

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

@@ -86,18 +86,21 @@ export class TradeService {
       }
     }
 
+    let addressOk = true;
+    let addressMessage: string | null = null;
     if (!onSitePickup) {
       const allowOnline = product.allowOnlinePurchase !== false;
       const allowCross = product.allowCrossCityDelivery !== false;
       if (deliveryType === 'LOCAL' && !allowOnline) {
-        throw new BadRequestException('该商品不支持线上购买');
-      }
-      if (deliveryType === 'CROSS_CITY') {
+        addressOk = false;
+        addressMessage = '该商品不支持线上购买';
+      } else if (deliveryType === 'CROSS_CITY') {
         if (!allowOnline) {
-          throw new BadRequestException('该商品不支持线上购买');
-        }
-        if (!allowCross) {
-          throw new BadRequestException('该商品不支持跨城配送');
+          addressOk = false;
+          addressMessage = '该商品不支持线上购买';
+        } else if (!allowCross) {
+          addressOk = false;
+          addressMessage = '该商品不支持跨城配送，请更换为开城城市内的收货地址';
         }
       }
     }
@@ -137,8 +140,13 @@ export class TradeService {
       /** 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),
+      /** 地址/履约未满足时仍返回预览，供确认页提示换地址；下单接口仍会硬校验 */
+      addressOk,
+      addressMessage,
       minQty,
       onSitePickup,
+      allowCrossCityDelivery: product.allowCrossCityDelivery !== false,
+      allowOnlinePurchase: product.allowOnlinePurchase !== false,
     };
   }
 
@@ -157,6 +165,9 @@ export class TradeService {
     if (preview.quantityOk === false) {
       throw new BadRequestException(preview.quantityMessage || '购买数量不满足起购要求');
     }
+    if (preview.addressOk === false) {
+      throw new BadRequestException(preview.addressMessage || '收货地址不可用');
+    }
 
     const onSitePickup = !!body.onSitePickup || preview.deliveryType === 'ON_SITE_PICKUP';
     let receiverName = '现场取货';