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This tutorial is built using Drupal 8.0. The fundamental concepts of Drupal 8 - like services & routing - are still valid, but newer versions of Drupal *do* have major differences.
Routing Wildcards
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Routing is packed with cool little features, but the most common thing you'll see
is the addition of wildcards. Add a /{count} to the end of the route's path:
| dino_says: | |
| path: /the/dino/says/{count} | |
| // ... lines 3 - 7 |
Because this is surrounded with curly-braces, the route will now match /the/dino/says/*anything*,
As soon as you have a routing wildcard called count, you can suddenly have a $count
argument in your controller function:
| // ... lines 1 - 6 | |
| class RoarController | |
| { | |
| public function roar($count) | |
| { | |
| // ... lines 11 - 12 | |
| } | |
| } |
The value for for the {count} part in the URL is passed to the $count argument.
Both the wildcard and the argument must have the same name.
Use $count to change our scary greeting: $roar = 'R'.str_repeat('0', $count).'AR!'.
Pass this to the Response:
| // ... lines 1 - 8 | |
| public function roar($count) | |
| { | |
| $roar = 'R'.str_repeat('O', $count).'AR!'; | |
| return new Response($roar); | |
| } | |
| // ... lines 14 - 15 |
We just changed the route configuration, so we need to rebuild the routing cache:
drupal router:rebuild
Once I do, the /the/dino/says page returns a 404! Ah! As soon as you add /{count}
to the route path, the route only matches when something is passed there. We need
/the/dino/says/*something*, anything but blank. There are ways to make the wildcard
optional - check out the Symfony routing docs.
Add 10 to the end of the URL:
Rooooooooooar! Make it 50 and the rooooooooooo....oooooooar gets longer.
Woah! You now know half of the new stuff in Drupal 8. It's this routing/controller layer. Make a route, then a controller and make that controller return a Response. Seriously, can we go on vacation now?
