By Matthias Noback


I've written A yr With Symfony for you, a developer who will paintings with Symfony2 for greater than a month (and most likely greater than a year). you've began examining your approach throughout the legit documentation ("The Book"), the cookbook, a few blogs, or a web instructional. you recognize now easy methods to create a Symfony2 program, with routing, controllers, entities or records, Twig templates and perhaps a few unit checks. yet after those simple steps, a few matters will bring up about...

- The reusability of your code - How if you happen to constitution your code to make it reusable in a destiny venture? or perhaps within the comparable undertaking, yet with a distinct view or in a console command?

- the standard of the inner API you've knowingly or unknowingly created - What are you able to do to make sure that your staff participants will comprehend your code, and should use it within the method it was once intended for use? how will you make your code versatile adequate for use in events reminiscent of the single you wrote it for?

- the extent of defense of your software - Symfony2 and Doctrine appear to instantly make you invulnerable for famous assaults in your internet program, like XSS, CSRF and SQL injection assaults. yet are you able to thoroughly depend on the framework? And what steps when you take to mend many of the ultimate issues?

- the internal workings of Symfony2 - for those who take one step farther from growing simply controllers and perspectives, you'll soon want to know extra in regards to the HttpKernel that is the center of a Symfony2 program. How does it understand what controller might be used, and which template? and the way are you able to override any determination that's made whereas dealing with a request?

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Matthias Noback @matthiasnoback

My identify is Matthias Noback. i'm a Hypertext Preprocessor, Symfony2, item orientated programming, test-driven improvement enthousiast, dwelling in Zeist with my female friend and son, who's jealous of me seeing that i'll examine a monitor all day.

In past years I've labored as software program developer with a different awareness to inner caliber coverage. Now I'm a contract developer, advisor and writer.

I usually submit approximately the various extra complex Symfony2-related subject matters on my web publication

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Each tag can also have any number of extra attributes (like alias above). These attributes allow you to further specify any requested behavior. To collect services with these tags, you have to create a compiler pass like this one: 40 Service patterns namespace Matthias\RendererBundle\DependencyInjection\Compiler; use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface; use Symfony\Component\DependencyInjection\ContainerBuilder; use Symfony\Component\DependencyInjection\Reference; class RenderersPass implements CompilerPassInterface { public function process(ContainerBuilder $container) { // collect all tagged services in the entire project $taggedServiceIds = $container ->findTaggedServiceIds('specific_renderer'); $objectRendererDefinition = $container->getDefinition('object_renderer'); foreach ($taggedServiceIds as $serviceId => $tags) { // services can have many tag elements with the same tag name foreach ($tags as $tagAttributes) { // call addRenderer() to register this specific renderer $objectRendererDefinition ->addMethodCall('addRenderer', array( $tagAttributes['alias'], new Reference($serviceId), )); } } } } Register this compiler pass in your bundle class: Service patterns 41 use Matthias\RendererBundle\DependencyInjection\Compiler\RenderersPass; use Symfony\Component\DependencyInjection\ContainerBuilder; class RendererBundle extends Bundle { public function build(ContainerBuilder $container) { $container->addCompilerPass(new RenderersPass()); } } Inside the process() method of the compiler pass, first all tags with the name specific_renderer are collected.

Think about it: if something is not the same as null, can it then be inferred that it is a logger? Optional setter calls Just like with required dependencies, there is sometimes a good case for injecting optional dependencies using a setter. Especially when you don’t want to muddle with the constructor signature: class AuthenticationListener { private $eventDispatcher; private $logger; public function __construct(EventDispatcherInterface $eventDispatcher) { $this->eventDispatcher = $eventDispatcher; } public function setLogger(LoggerInterface $logger = null) { $this->logger = $logger; } } In the service definition you can add a call to setLogger() with the logger service as an argument.

Instead of creating a mock for both the entity manager and the repository, you only have to create one for the repository itself. xml'); } } But some services can not be defined in a configuration file. They should be defined dynamically, because their name, class, arguments, tags, etc. are not fixed. Definition Manually creating a service definition means creating an instance of Definition, and optionally providing a class name. "> You can make the definition non-public if it only exists as a dependency of other services: $definition->setPublic(false); Arguments When the service requires some constructor arguments, you may set them all at once: Service patterns 48 use Symfony\Component\DependencyInjection\Reference; $definition->setArguments(array( new Reference('logger') // reference to another service true // boolean argument, array( 'table_name' => 'users' ) // array argument ...

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