store.js

let forecasts = new ForecastCollection();

var Store = _.extend({}, Backbone.Events, {
  initialize() {
    this.listenTo(forecasts, 'add remove change', () => this.trigger('change'));
  },

  getForecasts() {
    return forecasts.toJSON();
  },

  saveForecast(data) {
    return forecasts.create(data);
  }
});

Store.initialize();

export default Store;

/*
 * in your component
   store.saveForecast({
    balance: this.refs...
   });
 */