// login user
func LoginUser(user *User, c *beego.Controller, remember bool) {
// weird way of beego session regenerate id...
c.CruSession = beego.GlobalSessions.SessionRegenerateId(c.Ctx.ResponseWriter, c.Ctx.Request)
c.Ctx.Input.CruSession = c.CruSession
sess := c.StartSession()
sess.Set("auth_user_id", user.Id)
}