Change the default group pages to /messages

Support
10

Those links use a slightly different serializer - because not all the group data is needed there.

Still, you can store a filtered list of the current user’s groups on the initial page view and use those as a reference to check for membership. This information is already available in the initial payload, so there’s no overhead in terms of extra requests or anything like that. Something like this

<script type="text/discourse-plugin" version="0.8">
  const user = api.getCurrentUser();

  if (!user) {
    return;
  }

  const userGroups = user.groups.map(group => group.name);

  api.reopenWidget("pm-map-user-group", {
    transform(attrs) {

      const group = attrs.group;
      const isGroupUser = Object.values(userGroups).includes(group.name);

      // {href: "/g/foo"};
      let groupURL = this._super(...arguments);

      if (isGroupUser && group.has_messages) {
        groupURL.href = `${groupURL.href}/messages/`;
      }

      return groupURL;
    }
  });
</script>

Keep this snippet in its own script tags and add it to the header along with the other snippets. You keep it separate because it does a quick bail if the user is not logged in.