I am using Apache Solr to index a drupal site, and with facet_api enabled I have a set of useful facets available to me, so that I can filter by tag, author etc. I am using facetapi_select to display the facet options as a select (dropdown) instead of a normal list.
Facet API provides a date facet, and when the date facet is displayed as a list it presents the option to filter by Month, eg:
- June 2015 (3)
- August 2015 (5)
Unfortunately, when display is set to use the 'select' widget provided by facetapi_select, the month items no longer show up.
I have found a great article describing how to create custom facets, but as this is probably quite a quite common requirement I wonder if I am missing a way to do this more simply.