How to validate against other values?

jaysson commented 8 years ago

I am trying to validate a token against a user account, fetched by email.

const descriptor = {
        type: 'object',
        fields: {
            email: {
                type: 'string',
                required: true,
                test: function (cb) {
                    let regexp = /^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i;
                    if (!this.value.match(regexp)) {
                        this.raise('Invalid email address');
                    }
                    User.findOne({email: this.value}).then((user) => {
                        if (!user) {
                            this.raise('User not found');
                        }
                        cb();
                    }).catch((error) => {
                        throw error;
                    });
                }
            },
            token: {
                type: 'string',
                required: true,
                test: function (cb) {
                    // Need to get email here somehow
                    User.findOne({email: email, email_verification_token: this.value}).then((user) => {
                        if (!user) {
                            this.raise('Invalid token');
                        }
                        cb();
                    }).catch((error) => {
                        console.log(error)
                        this.raise(error.message)
                    });
                }
            }
        }
    };

I tried accessing this.source but it only contains the token while validating token. Email is removed after email validation.

In general, I can think of many use cases where you want to validate a field against another. For example, end_date > start_date.

How do I do this?