Chapters

26 Chapters | 2:53:08 |

01

Events, Events & Events!

5:10
02

Hooking into Symfony with an Event Subscriber

5:54
03

index.php to HttpKernel::handle()

6:50
04

RequestEvent & RouterListener

6:26
05

Routing Secrets & Request Attributes

7:47
06

The Controller Resolver

7:03
07

Who Creates the Controller & Gives it the Container?

8:04
08

How does the Controller Access the Container?

4:14
09

The Argument Resolver

8:13
10

Argument Value Resolvers

5:32
11

How Service Autowiring Works in a Controller Method

7:36
12

Calling the Controller & View Event

5:20
13

kernel.response Event & Request Format

6:36
14

Finishing the Request

6:03
15

Exception Handling

9:29
16

The Critical kernel.exception Event Listeners

7:07
17

FlattenException & Error Status Codes

6:10
18

Serializer Error Renderer: JSON/XML Errors

5:40
19

How the HTML Error Page is Rendered

7:34
20

The Magic `_controller` Attribute

6:36
21

Custom Global Controller Arguments

5:37
22

How Entity Controller Arguments Work

4:54
23

Sub Requests

7:54
24

Sub Requests & Request Data

5:40
25

Manually Making a Sub Request

6:34
26

Sub Request Attributes

9:05

> Symfony 5 > Symfony 5 Deep Dive! The HttpKernel Request-Response Flow

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08.

How does the Controller Access the Container?

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7 Comments

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ling 4 years ago

I don't understand the passage at 1:10, when you say: who's populating the this->container property?,
and then you talk about parameter_bag.
Is there a link between how the container is set and the parameter_bag? Or are they two different topics?

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weaverryan SFCASTS ling 4 years ago edited

Hey Pierre!

Ah, I can see how that is confusing! Before I explain WHO is setting $this->container, I start talking about the "parameter_bag" service to try to show you how "strange" this container property is. But I'm not YET explaining who sets it... and "parameter_bag" and $this->container are two different topics. The MOST important thing is really $this->container, which is set thanks to the service subscriber magic. The "parameter_bag" is simply ONE service that is in this mini-container.

Let me know if that make sense - I can totally see how that was confusing... I went on a tangent!

Cheers!

1 |

Volodymyr T. 5 years ago edited

I'm fascinated by @required annotation for AbstractController::setContainer method. It basically removes the need to declare the constructor in AbstractController class. When extending AbstractController in my child controller class, I have an opportunity to have my own constructor without the parent::__construct(ContrainerInterface $container); call. Convenient!
I wonder, and this is my question, what are other possible situations when @required annotation may come in handy? It's a cool tool but I don't really feel how to properly use it. E.g. is it possible to use @required with service factory when creating individual services with preset configuration values?

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weaverryan SFCASTS Volodymyr T. 5 years ago edited

Hey Volodymyr T.!

I'm fascinated by @required annotation for AbstractController::setContainer method.

It's neat, isn't it!

I wonder, and this is my question, what are other possible situations when @required annotation may come in handy? It's a cool tool but I don't really feel how to properly use it.

It does need to be used with caution. The reason is that, if you allow a dependency to be set via a setter method, then from an object-oriented level, it's not actually required. What I mean is, if someone tried to use your class outside of Symfony, then they might forget to call the setter and your code might explode (because it expects that property to be set). That is probably not a very realistic situation... but it's kind of a sign of "code smell": if a dependency is needed by your class, then you're sorta supposed to "force" it to be passed via a required constructor argument. So for me, the most common place I use this is to inject the logger because that's really an optional dependency - https://symfonycasts.com/screencast/symfony4-fundamentals/logger-trait.

is it possible to use @required with service factory when creating individual services with preset configuration values?

Ummm, I'm not sure! If you added @required above a method of a service factory, then Symfony would call that method before instantiating the factory (and so before it calls the method to create the real service). But I don't think I understand what you mean by "with preset configuration values". What trick are you thinking of? :)

Cheers!

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Thomas-A 6 years ago

Why there is a '?' in method getSubscribedServices ?

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MolloKhan SFCASTS Thomas-A 6 years ago edited

Hey Thomas A.

It means that such dependency is optional. In other words, if for any reason you don't have, let's say, the Serializer component installed, then your app won't explode but you should not ask for such service anyways

Cheers!

1 |

Thomas-A MolloKhan 6 years ago

OK, thanks!

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This tutorial also works well for Symfony 6!

Symfony 5

What PHP libraries does this tutorial use?

// composer.json
{
    "require": {
        "php": ">=8.2",
        "ext-iconv": "*",
        "antishov/doctrine-extensions-bundle": "^1.4", // v1.4.3
        "aws/aws-sdk-php": "^3.87", // 3.133.20
        "composer/package-versions-deprecated": "^1.11", // 1.11.99
        "doctrine/annotations": "^1.0", // 1.12.1
        "doctrine/doctrine-bundle": "^2.0", // 2.2.3
        "doctrine/doctrine-migrations-bundle": "^1.3|^2.0", // 2.2.2
        "doctrine/orm": "^2.5.11", // 2.8.2
        "easycorp/easy-log-handler": "^1.0", // v1.0.9
        "http-interop/http-factory-guzzle": "^1.0", // 1.0.0
        "knplabs/knp-markdown-bundle": "^1.7", // 1.9.0
        "knplabs/knp-paginator-bundle": "^5.0", // v5.4.2
        "knplabs/knp-snappy-bundle": "^1.6", // v1.7.1
        "knplabs/knp-time-bundle": "^1.8", // v1.16.0
        "league/flysystem-aws-s3-v3": "^1.0", // 1.0.24
        "league/flysystem-cached-adapter": "^1.0", // 1.0.9
        "league/html-to-markdown": "^4.8", // 4.9.1
        "liip/imagine-bundle": "^2.1", // 2.5.0
        "oneup/flysystem-bundle": "^3.0", // 3.7.0
        "php-http/guzzle6-adapter": "^2.0", // v2.0.2
        "phpdocumentor/reflection-docblock": "^5.2", // 5.2.2
        "sensio/framework-extra-bundle": "^5.1", // v5.6.1
        "symfony/asset": "5.0.*", // v5.0.11
        "symfony/console": "5.0.*", // v5.0.11
        "symfony/dotenv": "5.0.*", // v5.0.11
        "symfony/flex": "^1.9", // v1.21.6
        "symfony/form": "5.0.*", // v5.0.11
        "symfony/framework-bundle": "5.0.*", // v5.0.11
        "symfony/mailer": "5.0.*", // v5.0.11
        "symfony/messenger": "5.0.*", // v5.0.11
        "symfony/monolog-bundle": "^3.5", // v3.6.0
        "symfony/property-access": "5.0.*|| 5.1.*", // v5.1.11
        "symfony/property-info": "5.0.*|| 5.1.*", // v5.1.10
        "symfony/routing": "5.1.*", // v5.1.11
        "symfony/security-bundle": "5.0.*", // v5.0.11
        "symfony/sendgrid-mailer": "5.0.*", // v5.0.11
        "symfony/serializer": "5.0.*|| 5.1.*", // v5.1.10
        "symfony/twig-bundle": "5.0.*", // v5.0.11
        "symfony/validator": "5.0.*", // v5.0.11
        "symfony/webpack-encore-bundle": "^1.4", // v1.11.1
        "symfony/yaml": "5.0.*", // v5.0.11
        "twig/cssinliner-extra": "^2.12", // v2.14.3
        "twig/extensions": "^1.5", // v1.5.4
        "twig/extra-bundle": "^2.12|^3.0", // v3.3.0
        "twig/inky-extra": "^2.12", // v2.14.3
        "twig/twig": "^2.12|^3.0" // v2.14.4
    },
    "require-dev": {
        "doctrine/doctrine-fixtures-bundle": "^3.0", // 3.4.0
        "fakerphp/faker": "^1.13", // v1.13.0
        "symfony/browser-kit": "5.0.*", // v5.0.11
        "symfony/debug-bundle": "5.0.*", // v5.0.11
        "symfony/maker-bundle": "^1.0", // v1.29.1
        "symfony/phpunit-bridge": "5.0.*", // v5.0.11
        "symfony/stopwatch": "^5.1", // v5.1.11
        "symfony/var-dumper": "5.0.*", // v5.0.11
        "symfony/web-profiler-bundle": "^5.0" // v5.0.11
    }
}

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