Add radio-mixin to Mn 2.x Object

obj.js

import _ from 'underscore';
import Marionette from 'marionette';

import RadioMixin from './radio-mixin';

const Obj = Marionette.Object.extend({
    constructor(options) {
        this.options = _.extend({}, _.result(this, 'options'), options);

        this._initRadio();

        Marionette.Object.prototype.constructor.apply(this, arguments);
    }
});

_.extend(Obj.prototype, RadioMixin);

export default Obj;

radio-mixin.js

import _ from 'underscore';
import Radio from 'backbone.radio';
import Marionette from 'marionette';

// Marionette v3 back-port of Marionette.Object Radio API
function _iterateReplies(target, channel, bindings, actionName) {
    if(!channel || !bindings) return;

    // type-check bindings
    if(!_.isObject(bindings)) {
        throw new Marionette.Error({
            message: 'Bindings must be an object.',
            url: 'marionette.functions.html#marionettebindradiorequests'
        });
    }

    const normalizedRadioRequests = Marionette.normalizeMethods.call(target, bindings);

    channel[actionName](normalizedRadioRequests, target);
}

export default {
    _initRadio() {
        const channelName = Marionette._getValue(this.getOption('channelName'), this);

        if(!channelName) return;

        const channel = this._channel = Radio.channel(channelName);

        const radioEvents = Marionette._getValue(this.getOption('radioEvents'), this);
        this.bindRadioEvents(channel, radioEvents);

        const radioRequests = Marionette._getValue(this.getOption('radioRequests'), this);
        this.bindRadioRequests(channel, radioRequests);

        this.on('destroy', this._destroyRadio);
    },

    _destroyRadio() {
        this._channel.stopReplying(null, null, this);
    },

    getChannel() {
        return this._channel;
    },

    // Proxy `bindRadioEvents`
    bindRadioEvents: Marionette.proxyBindEntityEvents,

    // Proxy `unbindRadioEvents`
    unbindEntityEvents: Marionette.proxyUnbindEntityEvents,

    // Proxy `bindRadioRequests`
    bindRadioRequests(channel, bindings) {
        _iterateReplies(this, channel, bindings, 'reply');
    },

    // Proxy `unbindRadioRequests`
    unbindEntityRequests(channel, bindings) {
        _iterateReplies(this, channel, bindings, 'stopReplying');
    }
};