Gorm how to add extra field on many2many first create

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What version of Go are you using (`go version`)?

go version go1.13.5 darwin/amd64

Which database and its version are you using?

mysql ( base on vagrant )

Please provide a complete runnable program to reproduce your issue. IMPORTANT

Need to runnable with GORM's docker compose config or please provides your config.

package main

import (
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
    "github.com/uniplaces/carbon"
)

var db *gorm.DB

func init() {
    var err error
    db, err = gorm.Open("mysql", "gorm:gorm@tcp(localhost:9910)/gorm?charset=utf8&parseTime=True")
    if err != nil {
        panic(err)
    }
    db.LogMode(true)
}
var User struct {
   id uint `json:"id"`
   Email string `json:"string"`
  ......// other field
   Roles    []Role  `gorm:"many2many:role_users;" json:"-"`
}
var Role struct {
   id uint `json:"id"`
   name string `json:"name"`
  ....// other field
}
var RoleUser {
   RoleId uint `json:"role_id"`
   Role Role  `gorm:"-"`
   UserId uint `json:"user_id"`
   User User  `gorm:"-"`
   ExpiredAt  time.Time `json:"expired_at"` // how to add this field on many2many first create
}



func main() {
    // eg 
 if err :=    db.Where("id = ? ", 1 ).First(&user).error; err == nil{
    db.Where("id = ? ", 3 ).Find(&role)
   expired_at := carbon.Now().AddMonths(3)
  // the expired_at field how to insert into table with association
    db.Model(&user).Association("Roles").Append(&role)
   -----------------------------------------------------------------------
  // other available method
  var ru RoleUser
  ru.ExpiredAt = carbon.Now().AddMonths(3).Time
  db.Save(&ru) // useful
}
}

Comment From: github-actions[bot]

This issue will be automatically closed because it is marked as GORM V1 issue, we have released the public testing GORM V2 release and its documents https://v2.gorm.io/docs/ already, the testing release has been used in some production services for a while, and going to release the final version in following weeks, we are still actively collecting feedback before it, please open a new issue for any suggestion or problem, thank you

Also check out https://github.com/go-gorm/gorm/wiki/GORM-V2-Release-Note-Draft for how to use the public testing version and its changelog

Comment From: github-actions[bot]

Also check out https://github.com/go-gorm/gorm/wiki/GORM-V2-Release-Note-Draft for how to use the public testing version and its changelog

Comment From: ianprogrammer

@svcg did you find the solution ?

Comment From: sneko

@cleveng @ianprogrammer did you at the end?

EDIT: ok it seems https://github.com/go-gorm/gorm.io/commit/654fd7e8b5e2f431b4f104653f483dd83b841c41 could do the trick since the third struct exists in my code

Gorm how to add extra field on many2many first create

What version of Go are you using (go version)?

Which database and its version are you using?

Please provide a complete runnable program to reproduce your issue. IMPORTANT

What version of Go are you using (`go version`)?