重构优化套餐数据结构，修复提取计数问题

web/services/trade.go

@@ -35,12 +35,18 @@ func (s *tradeService) CreateTrade(uid int32, now time.Time, data *CreateTradeDa
 	platform := data.Platform
 	method := data.Method
 	tType := data.Product.GetType()
-	subject := data.Product.GetSubject()
-	amount := data.Product.GetAmount()
 	expire := time.Now().Add(30 * time.Minute)
+	subject, err := data.Product.GetSubject()
+	if err != nil {
+		return nil, err
+	}
+	amount, err := data.Product.GetAmount()
+	if err != nil {
+		return nil, err
+	}
 
 	// 实际支付金额，只在创建真实订单时使用
-	var amountReal = data.Product.GetAmount()
+	amountReal := amount
 	if env.RunMode == env.RunModeDev {
 		amountReal = decimal.NewFromFloat(0.01)
 	}
@@ -60,7 +66,7 @@ func (s *tradeService) CreateTrade(uid int32, now time.Time, data *CreateTradeDa
 			return nil, err
 		}
 
-		var expireAt = time.Time(u.Z(coupon.ExpireAt))
+		expireAt := time.Time(u.Z(coupon.ExpireAt))
 		if !expireAt.IsZero() && expireAt.Before(now) {
 			_, err = q.Coupon.
 				Where(q.Coupon.ID.Eq(coupon.ID)).
@@ -99,7 +105,7 @@ func (s *tradeService) CreateTrade(uid int32, now time.Time, data *CreateTradeDa
 	}
 
 	// 生成订单号
-	var tradeNo, err = ID.GenSerial()
+	tradeNo, err := ID.GenSerial()
 	if err != nil {
 		return nil, core.NewServErr("生成订单号失败", err)
 	}
@@ -692,8 +698,8 @@ type OnTradeCompletedData struct {
 
 type ProductInfo interface {
 	GetType() m.TradeType
-	GetSubject() string
-	GetAmount() decimal.Decimal
+	GetSubject() (string, error)
+	GetAmount() (decimal.Decimal, error)
 	Serialize() (string, error)
 	Deserialize(str string) error
 }