Drupal 8 Module Development - Second Edition

Service approach

The service approach involves creating a tagged service and referencing that in the route definition as a requirement. There are a number of advantages to this method compared to the one we've just seen:

• Allows you to encapsulate complex access logic in its own class
• Allows you to inject dependencies and make use of them in calculating the access
• Allows you to reuse the access checker on multiple routes

Let's take a look at how we can implement this for our Hello World route. We will replace the previous approach, but keep the goal of denying access to editors. However, to increase a bit complexity, editors will be allowed if the Hello World salutation has not been overridden via the configuration form. If you recall, in ...