优化订单支付

backend/internal/modules/wallet/repository.go

@@ -3,11 +3,11 @@ package wallet
 import (
 	"crypto/rand"
 	"fmt"
-	"math"
 	"time"
 
 	"hfb_sys/backend/internal/model"
 	"hfb_sys/backend/internal/timeutil"
+	"hfb_sys/backend/pkg/money"
 
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -260,7 +260,7 @@ func applyEntry(account *model.WalletAccount, entry Entry) (float64, error) {
 }
 
 func roundWalletMoney(value float64) float64 {
-	return math.Round(value)
+	return money.Round(value)
 }
 
 func toAccountDTO(account model.WalletAccount) *AccountDTO {

backend/internal/modules/wallet/repository_test.go

@@ -31,6 +31,34 @@ func TestApplyEntryRoundsMoneyBeforeComparing(t *testing.T) {
 	}
 }
 
+func TestApplyEntryKeepsWalletMoneyAtJiaoPrecision(t *testing.T) {
+	account := model.WalletAccount{
+		UserID:           8,
+		AvailableBalance: 0,
+	}
+	entry := Entry{
+		UserID:      8,
+		Direction:   "in",
+		Amount:      2.30,
+		BalanceType: "available",
+	}
+
+	balanceAfter, err := applyEntry(&account, entry)
+	if err != nil {
+		t.Fatalf("applyEntry() error = %v", err)
+	}
+	if balanceAfter != 2.3 {
+		t.Fatalf("balanceAfter = %v, want 2.3", balanceAfter)
+	}
+	if account.AvailableBalance != 2.3 {
+		t.Fatalf("AvailableBalance = %v, want 2.3", account.AvailableBalance)
+	}
+
+	if rounded := roundWalletMoney(2.36); rounded != 2.4 {
+		t.Fatalf("roundWalletMoney(2.36) = %v, want 2.4", rounded)
+	}
+}
+
 func TestNewLedgerNoUsesReadableFormat(t *testing.T) {
 	ledgerNo, err := newLedgerNo()
 	if err != nil {