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    <p>To persist entities, you need to first inject the entity manager into your class.</p> <pre><code>class ChatTopic implements TopicHandlerInterface { protected $em; public function __construct($em) { $this-&gt;em = $em; } } </code></pre> <p>You'll need to inject the dependency in services.xml</p> <pre><code>&lt;services&gt; &lt;service id="jdare_clank.chat_topic_handler" class="JDare\ClankChatBundle\Topic\ChatTopic"&gt; &lt;argument&gt;"@doctrine.orm.default_entity_manager"&lt;/argument&gt; &lt;/service&gt; </code></pre> <p>And get your class from the service container in a controller or some other ContainerAwareInterface:</p> <pre><code>$chatTopic = $this-&gt;getContainer()-&gt;get('jdare_clank.chat_topic_handler'); </code></pre> <p>Getting the user is trickier, since you won't have access to the security context in that class, since it is not container aware. There are a few ways you could do it. In our case, we actually implemented a secure websocket (wss) protocol and created a login protocol within, so we could store a user id with each connection. But one quick and dirty way would be to simply add the user id to your session in another controller.</p> <pre><code>$userId = $this-&gt;get('security.context')-&gt;getToken()-&gt;getUser()-&gt;getId(); $session = $this-&gt;get('session'); $session-&gt;set('user', (str) $userId); </code></pre> <p>Then you can get the user from the session inside your class.</p> <pre><code>public function onSubscribe(Conn $conn, $topic) { $userId = $conn-&gt;Session-&gt;get('user'); $user = $this-&gt;em-&gt;getRepository('AcmeUserBundle:User')-&gt;find((int) $userId); ... </code></pre> <p>Hope this is helpful. Let me know if any of this loses you, and I'll try to help. Dependency injection is a little hard to wrap your head around, but it's a very powerfool tool in your kit!</p>
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    1. COThis is very helpful ! But i don't get the "ContainerAwareInterface" part.. I have to use this service in an other controller like DefaultController.php ? Because i have already a PlaylistController who manage creation, modification and other stuf. So with $chatTopic = $this->getContainer()->get('jdare_clank.chat_topic_handler'); i can use my websocket in my PlaylistController ? Am i right ?
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    2. COContainerAwareInterface us any interface where you can use getContainer(), and Controllers are one such interface. So I think that will work!
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    3. COya but my onSubscribe function is called by javascripte when some client subscribe to the channel. so how can i trigger my controller when JS call onSubscribe? i cannot do $chatTopic->onSubscribe(params) because it's the JS who trigger this function ? am i clear ? (thanks for ur help btw)
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