Using mymodule.routing.yml, I can successfully create a custom route at /foo/{bar}/{baz}, but I cannot use /{bar}/{baz} or /{bar}/foo/{baz} as path for a route; they just return a 404 error.

Why? Is there any way to create a route for /{bar}/{baz} (with strict requirements for bar)?

I've read the entirety of the routing API and I can't seem to find any answers.

  • 1
    "Do new routes in Drupal 8 require a static first portion?" - yes. – user21641 Sep 29 '17 at 5:12

In the routing system you can't do this. What you can do is path aliasing.

Inbound: /{bar}/foo/{baz} -> /foo/{bar}/{baz}

Outbound: /foo/{bar}/{baz} -> /{bar}/foo/{baz}

You need a pattern to apply a regular expression on the path inbound, so /{bar}/{baz} is only possible if the parameters themselves have a distinctive pattern.

I didn't find a tutorial how to build a path processor, but you can use the PathProcessorFront class as example.

Register both as tagged service in the .services.yml file for the module.

    class: Drupal\Core\PathProcessor\PathProcessorFront
      - { name: path_processor_inbound, priority: 200 }
      - { name: path_processor_outbound, priority: 200 }
    arguments: ['@config.factory']
  • Awesome, that even answers the next question I was going to ask! – Darvanen Sep 29 '17 at 7:01

See Routing System on Drupal.org.

Path (required): The URL to the route, with a leading forward slash (e.g., path: '/book'). You can use dynamic properties by including them in curly braces. (e.g., path: '/node/{node}/outline'). These will be passed along as arguments via parameter converters to the controller/form (see below). Note that the first item of the path must not be dynamic. You can also define optional parameters at the end of your path (See 'Optional Parameters' on this page).

I hope this is enough to understand that routes cannot start with a slug. It must be a static value.

  • Voting up for the attempt, but screenshots aren't very useful to this community, I suggest a quote instead, this may be why you received a downvote. – Darvanen Sep 29 '17 at 7:03
  • Yep. I've added some emphasis to the bit that really answers the question too. – Darvanen Sep 29 '17 at 7:33

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