How do I use arguments with the Path Breadcrumb module?

Question

I am using the Path Breadcrumbs module to create breadcrumbs. I don't fully understand how to use arguments and selection rules, and thus I'm not sure how to create the following breadcrumb:

On the gallery node page (/gallery/%node), I want to use home > events >[event-name] > schedule as breadcrumbs.

Every Event node contains a node reference to a gallery node. I am trying to add this event name to the breadcrumbs. I already have retrieved the event name from $variables, following How do I retrieve node data for a referenced node in a template file?

Answer 1

As an last option you can implement theme_breadcrumb() in your theme template.php

Something like below sample code.

function themename_breadcrumb($variables) {
  if (arg(0) == "galery" && is_numeric(arg(1))) {

    // Get event title of the  event
    $event_nids = mymodulename_get_back_refernce_value(arg(1));

    // Note since a gallery can be referred by multiple event nodes so you have add logic which one you need to pick here, for now I am picking with array index as 0
    $event_node = node_load($events_nids[0]);

    $links[0] = l(t('Home'), '<front>');

   // inplace of 'events' add internal link path to events page.
    $links[1] = l(t('Events'),'events');
    $links[2] = l(t($event_node->title),'node/'.$event_node->nid);
    $links[3] = t('schedule');
    drupal_set_breadcrumb($links);
  }
}

Answer 2

The Path Breadcrumbs module works with system paths. For nodes system path looks like node/%, you can read more in the module FAQ and documentation.

The main problem with your example is that your Gallery content type doesn't have a reference field to Event, so other modules don't know if this Gallery node is referenced from that Event node.
There is a list of modules which may help with it on How do I implement two-way node references? (I didn't test them.)

Another way is to provide a computed entity property "Event" for Gallery content type with hook_entity_property_info_alter(). Doing so, your property will be available as a token in Path Breadcrumbs.