You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: authusergroup.xo.go
    path of file: ./repos/xo/_examples/django/mysql
    
    the code of the file until where you have to start completion: package mysql

// Code generated by xo. DO NOT EDIT.

import (
	"context"
)

// AuthUserGroup represents a row from 'django.auth_user_groups'.
type AuthUserGroup struct {
	ID      int64 `json:"id"`       // 
    
func AuthUserGroupByID(ctx context.Context, db DB, id int64) (*AuthUserGroup, error) {
	// query
	const sqlstr = `SELECT ` +
		`id, user_id, group_id ` +
		`FROM django.auth_user_groups ` +
		`WHERE id = ?`
	// run
	logf(sqlstr, id)
	aug := AuthUserGroup{
		_exists: true,
	}
	if err := db.QueryRowContext(ctx, sqlstr, id).Scan(&aug.ID, &aug.UserID, &aug.GroupID); err != nil {
		return nil, logerror(err)
	}
	return &aug, nil
}