Immutable Record with validate.js

validatable_record.js

// 
// Example for Immutable Record with validate.js
//

const _ = require("underscore");
const I = require("immutable");
const validate = require("validate.js");

function ValidatableRecord(args, rules = {}) {
  const _prototype = I.Record.prototype;
  
  _prototype._validationErrors = []
  _prototype.validate = function() {
    _prototype._validationErrors = 
      (validate(this.toJS(), rules, { format: "flat" }) || []); 
    return !!!_prototype._validationErrors.length
  }
  _prototype.getErrors = function() {
   	return _prototype._validationErrors; 
  }
  
  return I.Record(args);
}

/*
 * Usage
 */

const ManRecord = ValidatableRecord({ name: null }, {
  name: {
    presence: true,
    length: {
      maximum: 4
    }
  }
});

const man = new ManRecord({ name: "Justine" });

if (!man.validate()) {
	console.log(_.first(man.getErrors()));
}

This will not work with multiple Record factories, as only the last specified schema will be mounted on the prototype._validationErrors attribute