This is cool but I think its brittle against real world scenarios:

    func (r *Resource) get(w http.ResponseWriter, r *http.Request){
        user, err := r.authenticate(req)
        if err != nil {
            r.WriteJSONErr(w, err)
            return 
        }

        var records []*User
        if err := r.db.Select("select id, name, created_date from users", &records); err != nil {
            r.WriteJSONErr(w, err)
            return
        }

        r.WriteJSON(w, records)
    }

You would have to reformat all your function signatures to receive maybe a pointer to populate and return only an error, which could work but meh.