refactor.js

var UserModel = pd.make(Model,{
    get: function _get(id, cb) {
        // nano is a database client
        this.nano.get(id, 
            // whitelist runs every error through the white list,
            // if it fails (false) throw it
            // if it succeeds (true) pass it to cb
            error.whitelist(function _errors(err) {
                if (err.syscall === 'getaddrinfo') {
                    UserModel.get(id, cb);
                } else if (err.error === "not_found") {
                    return true;
                } else {
                    return false;
                }
            }, cb)
        );
    },
    insert: function _create(json, cb) {
        this.nano.insert(json, json._id, 
            error.whitelist(function _errors(err) {
                if (err.syscall === 'getaddrinfo') {
                    UserModel.insert(json, cb);
                } else if (err.error === "conflict") {
                    return true;
                } else {
                    return false;
                }
            }, cb)
        );
    },
    delete: function _delete(name, cb) {
        var that = this;
        this.get(name, function _getRev(err, body) {
            that.nano.destroy(name, body._rev, 
                error.whitelist(function _errors(err) {
                    if (err.syscall === 'getaddrinfo') {
                        UserModel.delete(name, cb);
                    } else {
                        return false;
                    }
                }, cb)
            );
        });
    }
});