feat: update aftersales service types and serial format

services/aftersales_service.go

@@ -108,26 +108,27 @@ func normalizeAftersalesSerial(sn string) string {
 }
 
 // generateUniqueSerial 生成唯一的售后工单序列号
-// 格式：zjbf-sh-YYMMNN，YY=年份后两位，MM=月份，NN=当月第几单（至少 2 位，溢出自然加宽）
+// 格式：zjbf-sh-YYMMDDNN，YY=年份后两位，MM=月份，DD=日期，NN=当天第几单（至少 2 位，溢出自然加宽）
 func (s *AftersalesService) generateUniqueSerial() (string, error) {
 	now := time.Now()
 	yy := now.Year() % 100
 	mm := int(now.Month())
+	dd := now.Day()
 
-	monthStart := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
-	nextMonth := monthStart.AddDate(0, 1, 0)
+	dayStart := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
+	nextDay := dayStart.AddDate(0, 0, 1)
 
-	// 统计本月已创建工单数（含软删除，避免编号回收）
+	// 统计当天已创建工单数（含软删除，避免编号回收）
 	var count int64
 	if err := database.DB.Unscoped().Model(&models.AftersalesOrder{}).
-		Where("created_at >= ? AND created_at < ?", monthStart, nextMonth).
+		Where("created_at >= ? AND created_at < ?", dayStart, nextDay).
 		Count(&count).Error; err != nil {
-		return "", fmt.Errorf("统计当月工单数失败: %w", err)
+		return "", fmt.Errorf("统计当日工单数失败: %w", err)
 	}
 
 	seq := int(count) + 1
 	for attempt := 0; attempt < 100; attempt++ {
-		candidate := fmt.Sprintf("%s%02d%02d%02d", aftersalesSerialPrefix, yy, mm, seq)
+		candidate := fmt.Sprintf("%s%02d%02d%02d%02d", aftersalesSerialPrefix, yy, mm, dd, seq)
 
 		var existing models.AftersalesOrder
 		result := database.DB.Unscoped().Where("serial_number = ?", candidate).First(&existing)