Routing and path aliases

Question

I have created a module with its routing.yml file.

mymodule.dossier:
  path: '/dossiers/{node}/dossier'
  defaults:
    _entity_view: 'node.dossier_dossier'
  requirements:
    _permission: 'access content'

I have created a custom view mode (node.dossier_dossier) and the corresponding Twig template. If I go to dossiers/1/dossier, it works, and it displays the node with the dossier_dossier view mode and appropriate template.

node/1 has /dossiers/my-custom-path as its path alias, which is automatically set from the Pathauto module. If I try to access /dossiers/my-custom-path/dossier, it returns a Page not found error.

How can I make this route work for my nodes for both (default and path aliases) URLs?

Edit: I should maybe mention why I need that:

• /dossiers/my-custom-path should display the node using the default view mode
• /dossiers/my-custom-path/dossier should display the node using the dossier_dossier view mode
• /dossiers/my-custom-path/abstract should display the node using yet another view mode (I'd create another route for that one presumably)

Answer 1

The subpathauto module (depends on pathauto) might help you here: https://www.drupal.org/project/subpathauto

I have a pathauto alias on my site for /node/{id} (let's call it /node-slug). By installing and enabling the subpathauto module, I was able to create a custom route /node/{id}/locations which is now accessible via /node-slug/locations

Answer 2

Pathauto can't do this, it can only generate aliases to the default view mode.

You can write your own Pathauto module, which generates for each view mode a separate aliases. For a single purpose module there is not much work to do, you only need to generate the aliases and use

\Drupal::service('path.alias_storage')->save($source, $alias);

to save them.

The problem is, you get a very large url_alias table.

Or use route_callbacks: in *.routing.yml, then define in this callback for each view mode a different route, which calls a Controller, which then in case you have a hit on the route will look up the middle part of the alias and return a redirect to the node in the requested view mode. This is without the static alias table, but may take longer for each request.