多对多关系时，使用save()方法去更新数据时，会在关联表中新增一条数据，期望是更新
表结构：
type DnsPreplanAtom struct {
Model
Name string json:"name"
OriginValue string json:"origin_value"
TargetValue string json:"target_value"
Domain string json:"domain"
LineName string json:"line_name"
LineId int json:"line_id"
Updator string json:"updator"
ProductTreeId string json:"product_tree_id"
ProductTreeName string json:"product_tree_name"
Status int json:"status"
ExecuteStatus int json:"execute_status"
DnsPreplanService []DnsPreplanService json:"dns_preplan_services" gorm:"many2many:dns_preplan_service_atom_rel"
}
type DnsPreplanService struct {
Model
Name string json:"name"
Desc string json:"desc"
Updator string json:"updator"
Status int json:"status" gorm:"default:1"
ExecuteStatus int json:"execute_status" gorm:"default:0"
ProductTreeId string json:"product_tree_id"
ProductTreeName string json:"product_tree_name"
DnsPreplanAtom []DnsPreplanAtom json:"dns_preplan_atoms" gorm:"many2many:dns_preplan_service_atom_rel;"
}
想请教下如果期望更新的话，应该怎么做？ 当前使用的gorm 是v2版本
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