procergs/login-cidadao-badges-template

Template project for the badges system.

Badges Template

This project is a template/example for implementing badges compatible with login-cidadao., _(*1)

Implementing Your Own Badges

Bundle Generation

First of all, generate a new Symfony 2 bundle and name it as you see fit. In this example we'll call it "Acme\BadgesBundle"., _(*2)

Go on and start the interactive bundle generator:, _(*3)

``` bash $ php app/console generate:bundle, <sub>(*4)</sub>

### Badge Model

We'll need a Model class to represent your badges. This class can be as simple as the implementation of the `PROCERGS\LoginCidadao\BadgesBundle\Model\BadgeInterface`, thus we have:

```php
<?php

namespace Acme\BadgesBundle\Model;

use PROCERGS\LoginCidadao\BadgesBundle\Model\BadgeInterface;

class AcmeBadge implements BadgeInterface
{

    protected $namespace;
    protected $name;
    protected $data;

    public function __construct($namespace, $name, $data = null)
    {
        $this->namespace = $namespace;
        $this->name = $name;
        $this->data = $data;
    }

    public function getData()
    {
        return $this->data;
    }

    public function getName()
    {
        return $this->name;
    }

    public function getNamespace()
    {
        return $this->namespace;
    }

}

Event Subscriber: where the magic happens

Now that we can represent our badge, let's create the class that will respond the Badge System's events. Luckly all the boring stuff is already done by the PROCERGS\LoginCidadao\BadgesBundle\Model\AbstractBadgesEventSubscriber abstract class. All we have to do is implement the missing methods and handle the event as needed to validate our badges., <sub>(*5)</sub>

The badge validation is done in the onBadgeEvaluate(EvaluateBadgesEvent) method and that's where the hard work should be done. This is defined in the AbstractBadgesEventSubscriber., <sub>(*6)</sub>

We also need the __construct() method that will tell the application what badges are provided by this bundle. In this example we won't use translation but you could simply inject the @translator service into this class and translate the messages in this method. Also in the constructor you have to setup your badge's "namespace". In this example we used acme_badges., <sub>(*7)</sub>

``` php <?php, <sub>(*8)</sub>

namespace Acme\BadgesBundle\Event;, <sub>(*9)</sub>

use PROCERGS\LoginCidadao\BadgesBundle\Model\AbstractBadgesEventSubscriber; use PROCERGS\LoginCidadao\BadgesBundle\Event\EvaluateBadgesEvent; use Acme\BadgesBundle\Model\AcmeBadge;, <sub>(*10)</sub>

class BadgesSubscriber extends AbstractBadgesEventSubscriber {, <sub>(*11)</sub>

public function __construct()
{
    $this->registerBadge('random_even', 'A person with this badge had the luck of getting an even number in rand(1,10)');
    $this->setName('acme_badges');
}

public function onBadgeEvaluate(EvaluateBadgesEvent $event)
{
    if (rand(1,10) % 2 === 0) {
        $event->registerBadge(new AcmeBadge($this->getName(), 'random_even', true));
    }
}

}, <sub>(*12)</sub>

### Almost done: services.yml

Now all we have to do is tell the application we exist by configuring the bundle's services.yml like so:

``` yaml
parameters:
    acme_badges.subscriber.class: Acme\BadgesBundle\Event\BadgesSubscriber

services:
    acme_badges.subscriber:
        class: %acme_badges.subscriber.class%
        tags:
            - { name: kernel.event_subscriber }

This tells the application that the service acme_badges.subscriber is an event subscriber so it'll get notified when one of it's subscribed events are triggered., <sub>(*13)</sub>

That's it!

Assuming your bundle is correctly added in app/AppKernel.php, all your badges will be automatically detected, no extra configuration needed., <sub>(*14)</sub>

If you wish to trigger the badge evaluation event manually you can:, <sub>(*15)</sub>

``` php use PROCERGS\LoginCidadao\BadgesBundle\BadgesEvents; use PROCERGS\LoginCidadao\BadgesBundle\Event\EvaluateBadgesEvent; use PROCERGS\LoginCidadao\BadgesBundle\Event\ListBadgesEvent;, <sub>(*16)</sub>

/** @var \PROCERGS\LoginCidadao\CoresBundle\Model\PersonInterface **/ $user = $this->getUser();, <sub>(*17)</sub>

/** @var \PROCERGS\LoginCidadao\BadgesBundle\Handler\BadgesHandler **/ $badgesHandler = $this->get('badges.handler');, <sub>(*18)</sub>

$badgesHandler->evaluate($user); var_dump($user->getBadges()); // this may or may not return the badge we created here since it's based on random stuff., <sub>(*19)</sub>

$badges = $badgesHandler->getAvailableBadges(); var_dump($badges); // this will list all available badges ```, <sub>(*20)</sub>