退款订单列表增加金额汇总

refundOrder/list 响应增加 totalMoney(单位:分),走 $sum 聚合统计
整个筛选结果的退款金额,而不是当前这一页 —— 按渠道搜出几百笔时
只汇总当页会得出错误金额。

命中数为 0 时直接返回,不再多跑一次聚合和列表查询。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

api/proto/refundOrder.go

@@ -20,8 +20,9 @@ type RefundOrderListReq struct {
 }
 
 type RefundOrderListResp struct {
-	Total int64                          `json:"total"`
-	List  refundOrderMod.RefundOrderList `json:"list"`
+	Total      int64                          `json:"total"`
+	TotalMoney int64                          `json:"totalMoney"` // 符合当前筛选条件的共退款金额(单位:分),非仅当前页
+	List       refundOrderMod.RefundOrderList `json:"list"`
 }
 
 // RefundOrderItem 一笔待回填的订单。

models/refundOrderMod/refund.go

@@ -93,6 +93,29 @@ func CountRefundOrders(ctx context.Context, filter bson.M) (int64, error) {
 	return count, nil
 }
 
+// SumRefundOrderMoney 按同一 filter 汇总退款金额(单位:分)。
+// 走聚合而不是把 money 累加在业务层,是为了统计整个查询结果而不只是当前这一页。
+func SumRefundOrderMoney(ctx context.Context, filter bson.M) (int64, error) {
+	var ret []struct {
+		TotalMoney int64 `bson:"totalMoney"`
+	}
+	pipeline := []bson.M{
+		{"$match": filter},
+		{"$group": bson.M{
+			"_id":        nil,
+			"totalMoney": bson.M{"$sum": "$" + FN.RefundOrder.Money},
+		}},
+	}
+	if err := db.Aggregate(ctx, &ret, pipeline); err != nil {
+		log.Warn("refundOrderMod SumMoney failed", log.E(err), log.Any("filter", filter))
+		return 0, err
+	}
+	if len(ret) == 0 {
+		return 0, nil // 没有命中任何记录
+	}
+	return ret[0].TotalMoney, nil
+}
+
 func DelOneRefundOrder(ctx context.Context, filter bson.M) (int64, error) {
 	count, err := db.DeleteOne(ctx, filter)
 	if err != nil {

service/refundOrderSer/refund.go

@@ -51,6 +51,14 @@ func List(ctx context.Context, req *proto.RefundOrderListReq) (*proto.RefundOrde
 	if err != nil {
 		return nil, err
 	}
+	if total == 0 {
+		return resp, nil // 没有命中,汇总和列表都不用再查
+	}
+	// 汇总整个筛选结果的退款金额,与分页无关
+	totalMoney, err := refundOrderMod.SumRefundOrderMoney(ctx, filter)
+	if err != nil {
+		return nil, err
+	}
 	opt := &options.FindOptions{}
 	opt.SetSort(bson.D{{Key: refundOrderMod.FN.RefundOrder.CreatedAt, Value: -1}})
 	opt.SetSkip((req.PageNum - 1) * req.PageSize)
@@ -60,6 +68,7 @@ func List(ctx context.Context, req *proto.RefundOrderListReq) (*proto.RefundOrde
 		return nil, err
 	}
 	resp.Total = total
+	resp.TotalMoney = totalMoney
 	resp.List = list
 	return resp, nil
 }