Gorm预加载时如何制定关联关系表中某个字段的值

type UpgradeTask struct {
    Id          int      `json:"id" gorm:"primaryKey"`
    PreScripts  []Script `json:"pre_scripts" gorm:"many2many:yb_task_script_relation;ForeignKey:id;JoinForeignKey:task_id;References:id;JoinReferences:script_id;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
    PostScripts []Script `json:"post_scripts" gorm:"many2many:yb_task_script_relation;ForeignKey:id;JoinForeignKey:task_id;References:id;JoinReferences:script_id;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
}

type Script struct {
    Id         int    `json:"id" gorm:"primaryKey"`
    ScriptName string `json:"script_name"`
}

type TaskScript struct {
    Id         int `json:"-" gorm:"id;primaryKey"`
    TaskId     int `json:"task_id"`
    ScriptId   int `json:"script_id"`
    ScriptType int `json:"script_type"`
}
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