rivets jquery-validate binder (+ handle mongoose errors)

rivets-validate

rivets.binders['on-valid'] = {
    'function': true,
    unbind: function(el) {
        $(el).data('validator', null)
            .unbind('validate');
    },
    routine: function(el, value) {
        var handler = this.handler = this.eventHandler(value);
        return $(el)
            .on('submit', function() { return false; })
            .validate({
                submitHandler: function(form) {
                    var validator = this,
                        promise = handler({
                            target: $(form),
                            validator: validator,
                            preventDefault: $.noop
                        });
                    if (!promise.fail)
                        return;

                    // handle mongoose errors
                    promise.fail(function(res) {
                        res = res.responseJSON;
                        if (!res)
                            return console.error('ERROR', promise.responseText);
                        if (!res.errors)
                            return;
                        var errors = {};
                        $.each(res.errors, function(k, v) {
                            errors[k] = v.message;
                        });
                        validator.showErrors(errors);
                    });
                }
            });
    }
};