Serialization for converting between JS and Rails naming conventions

gistfile1.txt

'use strict';

var Model = require('ampersand-model');
var _     = require('lodash');

var CAMEL_CASE = 'camelCase';
var SNAKE_CASE = 'snakeCase';

var BaseModel = Model.extend({
  initialize: function () {
    this._originalFns = {
      serialize: _.bind(Model.prototype.serialize, this)
    };
  },

  toSnakeCase: function (obj) {  
    return this._toCase(obj, SNAKE_CASE);
  },

  toCamelCase: function (obj) {
    return this._toCase(obj, CAMEL_CASE);
  },

  _toCase: function (obj, toCaseFnName) {
    var res = {};
    var transformedKey;

    _.each(obj, function (value, key) {
      transformedKey = _[toCaseFnName](key);

      if (_.isArray(value)) {
        res[transformedKey] = _.toArray(this._toCase(value, toCaseFnName));
      } else if (_.isObject(value)) {
        res[transformedKey] = this._toCase(value, toCaseFnName);
      } else {
        res[transformedKey] = value;
      }
    }, this);

    return res;
  }
});

module.exports = BaseModel;

Looks pretty awesome. Let's see an ES6 version with a few JS tests.