minor #9527 Made all examples of "Quick Tour" complete (all "use", "namespaces", etc.) (javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
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Made all examples of "Quick Tour" complete (all "use", "namespaces", etc.)

After #9522 I thought we could make all "Quick Tour" examples complete. This is worse for expert developers ... but I think it's better for newcomers, which are the readers of these articles.

Commits
-------

7ab953c Made all examples of "Quick Tour" complete (all "use", "namespaces", etc.)

Author: javiereguiluz

quick_tour/flex_recipes.rst

@@ -76,8 +76,10 @@ Thanks to Flex, after one command, you can start using Twig immediately:
 .. code-block:: diff
 
     // src/Controller/DefaultController.php
-    // ...
+    namespace App\Controller;
 
+    use Symfony\Component\Routing\Annotation\Route;
+    - use Symfony\Component\HttpFoundation\Response;
     + use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 
     -class DefaultController
@@ -150,15 +152,26 @@ Rich API Support
 
 Are you building an API? You can already return JSON easily from any controller::
 
-    /**
-     * @Route("/api/hello/{name}")
-     */
-    public function apiExample($name)
+    // src/Controller/DefaultController.php
+    namespace App\Controller;
+
+    use Symfony\Component\Routing\Annotation\Route;
+    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+
+    class DefaultController extends AbstractController
     {
-        return $this->json([
-            'name' => $name,
-            'symfony' => 'rocks',
-        ]);
+        // ...
+
+        /**
+         * @Route("/api/hello/{name}")
+         */
+        public function apiExample($name)
+        {
+            return $this->json([
+                'name' => $name,
+                'symfony' => 'rocks',
+            ]);
+        }
     }
 
 But for a *truly* rich API, try installing `Api Platform`_:
@@ -176,8 +189,6 @@ rich API for a ``product`` table? Create a ``Product`` entity and give it the
 ``@ApiResource()`` annotation::
 
     // src/Entity/Product.php
-    // ...
-    
     namespace App\Entity;
 
     use ApiPlatform\Core\Annotation\ApiResource;

quick_tour/the_architecture.rst

@@ -21,14 +21,24 @@ Want a logging system? No problem:
 This installs and configures (via a recipe) the powerful `Monolog`_ library. To
 use the logger in a controller, add a new argument type-hinted with ``LoggerInterface``::
 
+    // src/Controller/DefaultController.php
+    namespace App\Controller;
+
     use Psr\Log\LoggerInterface;
-    // ...
+    use Symfony\Component\Routing\Annotation\Route;
+    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 
-    public function index($name, LoggerInterface $logger)
+    class DefaultController extends AbstractController
     {
-        $logger->info("Saying hello to $name!");
+        /**
+         * @Route("/hello/{name}")
+         */
+        public function index($name, LoggerInterface $logger)
+        {
+            $logger->info("Saying hello to $name!");
 
-        // ...
+            // ...
+        }
     }
 
 That's it! The new log message will be written to ``var/log/dev.log``. Of course, this
@@ -89,16 +99,27 @@ this code directly in your controller, create a new class::
 
 Great! You can use this immediately in your controller::
 
+    // src/Controller/DefaultController.php
+    namespace App\Controller;
+
     use App\GreetingGenerator;
-    // ...
+    use Psr\Log\LoggerInterface;
+    use Symfony\Component\Routing\Annotation\Route;
+    use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 
-    public function index($name, LoggerInterface $logger, GreetingGenerator $generator)
+    class DefaultController extends AbstractController
     {
-        $greeting = $generator->getRandomGreeting();
+        /**
+         * @Route("/hello/{name}")
+         */
+        public function index($name, LoggerInterface $logger, GreetingGenerator $generator)
+        {
+            $greeting = $generator->getRandomGreeting();
 
-        $logger->info("Saying $greeting to $name!");
+            $logger->info("Saying $greeting to $name!");
 
-        // ...
+            // ...
+        }
     }
 
 That's it! Symfony will instantiate the ``GreetingGenerator`` automatically and
@@ -108,6 +129,7 @@ difference is that it's done in the constructor:
 
 .. code-block:: diff
 
+    // src/GreetingGenerator.php
     + use Psr\Log\LoggerInterface;
 
     class GreetingGenerator
@@ -174,6 +196,7 @@ After creating just *one* file, you can use this immediately:
 
 .. code-block:: twig
 
+    {# templates/default/index.html.twig #}
     {# Will print something like "Hey Symfony!" #}
     <h1>{{ name|greet }}</h1>
 

quick_tour/the_big_picture.rst

@@ -69,6 +69,7 @@ page. Uncomment the example that already lives in the file:
 
 .. code-block:: yaml
 
+    # config/routes.yaml
     index:
         path: /
         controller: 'App\Controller\DefaultController::index'
@@ -80,6 +81,7 @@ doesn't exist yet, so let's create it!
 In ``src/Controller``, create a new ``DefaultController`` class and an ``index``
 method inside::
 
+    // src/Controller/DefaultController.php
     namespace App\Controller;
 
     use Symfony\Component\HttpFoundation\Response;
@@ -115,13 +117,18 @@ like a wildcard that matches anything. And it gets better! Update the controller
 .. code-block:: diff
 
     // src/Controller/DefaultController.php
-    // ...
+    namespace App\Controller;
+
+    use Symfony\Component\HttpFoundation\Response;
 
-    - public function index()
-    + public function index($name)
+    class DefaultController
     {
-    -     return new Response('Hello!');
-    +     return new Response("Hello $name!");
+    -     public function index()
+    +     public function index($name)
+        {
+    -         return new Response('Hello!');
+    +         return new Response("Hello $name!");
+        }
     }
 
 Try the page out by going to ``http://localhost:8000/hello/Symfony``. You should
@@ -148,28 +155,42 @@ Instead, add the route *right above* the controller method:
 .. code-block:: diff
 
     // src/Controller/DefaultController.php
-    // ...
+    namespace App\Controller;
 
+    use Symfony\Component\HttpFoundation\Response;
     + use Symfony\Component\Routing\Annotation\Route;
 
-    + /**
-    +  * @Route("/hello/{name}")
-    +  */
-    public function index($name)
+    class DefaultController
+    {
+    +    /**
+    +     * @Route("/hello/{name}")
+    +     */
+         public function index($name) {
+             // ...
+         }
+    }
 
 This works just like before! But by using annotations, the route and controller
 live right next to each other. Need another page? Just add another route and method
 in ``DefaultController``::
 
     // src/Controller/DefaultController.php
-    // ...
+    namespace App\Controller;
+
+    use Symfony\Component\HttpFoundation\Response;
+    use Symfony\Component\Routing\Annotation\Route;
 
-    /**
-     * @Route("/simplicity")
-     */
-    public function simple()
+    class DefaultController
     {
-        return new Response('Simple! Easy! Great!');
+        // ...
+
+        /**
+         * @Route("/simplicity")
+         */
+        public function simple()
+        {
+            return new Response('Simple! Easy! Great!');
+        }
     }
 
 Routing can do *even* more, but we'll save that for another time! Right now, our