This document contains information about filtering search results with facets with the Apache Solr Search module.
To enable search facets, you must install and enable the Drupal 7 Facet API module.
If you are an administrator with search settings permissions, you can go to the Apache Solr Search > Settings > Facets tab and enable the facets you want to use in your search pages. The facets displayed on the Facets tab depend on the bundles and entities that you have enabled on your website, and the other search-related modules that you have installed. For more information, read Modules for Acquia Search.
Facet configuration operations
For each enabled facet, you can select the following operations:
Configure display
You can configure how each facet displays in the search results on the Configure display page. From the Configure display page, you can configure the following:
Display widget
The Facet API includes two basic display widgets: links and links with checkboxes. Other modules (such as Facetapi Slider) can provide other display widgets.
Soft limit
The soft limit limits the number of facets displayed initially. Other facets display after clicking the Show more link.
Empty facet behavior
Empty facet behavior controls the action to take when a facet has no items. The default is not displaying the facet if the search returned no items for the facet. You can select Display text, and then enter and format the text to display for an empty facet.
Sort rules
You can configure how to sort the facets in the sort rules. Each sort rule can display in ascending or descending order, and can have a weight assigned to determine the order to apply the sort rules.
Global settings
The global settings for facet configuration apply to the facet across all realms.
Hard limit
The hard limit displays no more than the configured number of items per facet.
Minimum facet count
The minimum facet count displays facets matching in the configured number of documents. The default number is 1. You can increase the number to delete some facets, even if they contain search result items.
Configure dependencies
In order for the server to process facets, and display them to the user, dependencies must meet all conditions. Dependencies are based on either bundles or roles.
Bundle-based dependencies
Using bundle-based dependencies, you can control whether a given facet must display based on the bundle (such as content type).
Role-based dependencies
Using role-based dependencies, you can control whether a given facet must display to a user based on the user’s role.
Configure filters
The Configure filters operation enables, disables, and weights facet filters created using search-related contributed and custom modules.
Export configuration
Using the export configuration operation, you can view, copy, and paste a PHP version of the facet’s configuration. By exporting a facet’s configuration to code, you can use version control for the configuration, and export the configuration to other sites.
Block cache settings
The Apache Solr Search > Settings > Facets tab also displays your Block cache settings. For best performance, enable block caching, which you can do on the Administration > Configuration > Development > Performance page. For more information, see Page and block caching in Creating content recommendation blocks.