Changes to Symfony Tutorials for Symfony 3.3

Symfony 3.3 comes with some pretty revolutionary changes to autowiring and how services are registered and named. Woo! We talk about all of these cool things in our Symfony 3.3: Upgrade, Autowiring & Autoconfigure tutorial.

Problems with Existing Tutorials?

All these new features are optional.. but if you start a new project today, these features are activated automatically. Why? Because a new Symfony 3.3 (or 3.4) project comes with this code in app/config/services.yml:

# app/config/services.yml
services:
    _defaults:
        autowire: true
        autoconfigure: true
        public: false

    AppBundle\:
        resource: '../../src/AppBundle/*'
        exclude: '../../src/AppBundle/{Entity,Repository,Tests}'

    AppBundle\Controller\:
        resource: '../../src/AppBundle/Controller'
        public: true
        tags: ['controller.service_arguments']

I love these new features. But, most tutorials on KnpU were created before Symfony 3.3: so before these features existed. This can cause a few issues!

The Fix

If you like to code along with our tutorials (yay!), your best option is to always download the course code from the tutorial page and use the start/ directory. That way, you're coding along with the exact code we used in the tutorials.

But, if you'd rather code along with a new project, then, to avoid problems, comment out all of the new code in services.yml (unless we say in the tutorial that we're using the new Symfony 3.3 autowiring goodness).

Yep, that's it! Then later, when you're curious, check out the Symfony 3.3: Upgrade, Autowiring & Autoconfigure tutorial to learn about this new stuff!

And of course, if you ever have any questions at all, just add a comment below the video: we're happy to help!

Autowiring Deprecation Warnings

Oh, one last thing! If you're following the pre-Symfony 3.3 tutorials, when you take advantage or autowiring, you may start to see deprecation warnings. Don't worry about this! The way autowiring works has changed a little bit in Symfony 3.3. You can learn more about these deprecations by watching Autowiring Deprecations.

Have fun!