How to pass group context to custom form page using group module

Question

I have a custom block that is displayed within each group on every page. The block visibility is set to /league/*

The custom block shows up fine for /league/{gid}, /league/{gid}/members, /league/{gid}/edit, /league/{gid}/invitations etc.

I created a custom form with a route of /league/{gid}/segments, but my block is not rendering correctly on that page because of this line in my block:

if (($group = $this->getContextValue('group')) && $group->id()) {

I got that line from the group module /src/Plugin/Block/GroupOperationsBlock.php

$this->getContextValue('group')) is not defined.

How can I pass the group context to that form page? I tried adding the options of group to the route like this, but no luck:

mymodule.segments:
  path: '/league/{gid}/segments'
  defaults:
    _title: 'Segments'
    _form: 'Drupal\mymodule\Form\SegmentsForm'
  requirements:
    _permission: 'authenticated'
  options:
    parameters:
      group:
        type: 'entity:group'

Any ideas?

Answer 1

In order for the Group to be part of the page context, it needs to be named {group} in your path. So you will need to change this:

path: '/league/{gid}/segments'

To this:

path: '/league/{group}/segments'