Breadcrumb reaction doesn't work with Islandora objects

[mjordan]

The "Breadcrumb" reaction that ships with the contrib Context module doesn't work with Islandora objects. To replicate the behavior of this plugin, which is to replace a page's breadcrumb with the link to the selected menu item, we could probably implement hook_islandora_breadcrumbs_alter() to replace the breadcrumbs generated by Islandora with a link to the selected menu item. Won't do that until someone asks for it though.

[mjordan]

One possible use case would be to display a breadcrumb trail containing links to its parent collections. If building this list could be made performant, this reaction might be useful to those sites that have turned of "Render Drupal breadcrumbs" for scalability reasons. Might go like this:

1. Get object's parent collection PIDs
2. For each of the collections, do the following query to get the corresponding collection object's title: "http://localhost:8080/solr/select?version=1.2&wt=json&json.nl=map&fl=fgs_label_s&q=PID:%22islandora:sp_basic_image_collection%22"
3. Use drupal_set_breadcrumb() to render the breadcrumb

[mjordan]

Tried this in the breadcrumb branch, but for some reason drupal_set_breadcrumb is not working.