update.go

type Plan struct {
  [....]	
	Active bool `json:"active"`
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`
}

db.Model(&plan).Where("id = ?", id).Updates(Plan{
		Name: name,
		Period: period,
		IntervalCount: interval_count,
		Currency: currency,
		Amount: amount,
		LimitUsers: limit_users,
		Active: !(status == 0),
		TrialPeriodDays: trial_period_days,
	})