README

Formats a field as links into a Search API search page, pre-filtered by a Facets facet whose value is set to the field value.

For example, a "Genus" field rendered with this formatter becomes a link to your search page with the Genus facet already filtered to that value.

Supported field types

The formatter is available for every field type. The value used in the facet query is resolved per field type:

• Reference fields (entity_reference, typed_relation, …): the referenced entity's label is used, so the facet is filtered by the readable value (e.g. the taxonomy term name) rather than the internal entity id.
• All other fields (text, string, list, numeric, boolean, datetime, …): the field's main property value is used.

This matches how such fields are normally indexed and faceted in Solr — make sure the facet you select indexes the same readable value.

You can override this per field with the Facet value setting:

• Automatic (default): referenced entity label for reference fields, the field value otherwise.
• Referenced entity label: always use the referenced entity's label.
• Raw stored value: use the stored value — the entity id for reference fields. Choose this when your facet indexes entity ids rather than labels.

Dependencies

• search_api_solr
• facets

Configuration

The formatter is configured per field, under Manage display for the entity (e.g. /admin/structure/types/manage/<bundle>/display). Choose the Solr Facet Field Formatter format for a text/string field and set:

• Search page (facet source): the search results page the link points to. This determines both the URL path and the facet filter key, read from the selected facet source.
• Facet: the facet to filter on. Pick the facet configured for this field on the chosen search page. Its URL alias is used as the facet key in the generated query.
• Facet value: which value of the field to filter by. See Supported field types above.
• Reset fulltext search (optional): adds an empty fulltext query parameter so following the link starts a fresh, facet-only search. The parameter name (default search_api_fulltext) is configurable to match your view's exposed fulltext filter.

The generated link matches the query string that Facets itself produces, e.g. /<search-path>?f[0]=<facet-alias>:<field-value>.

Upgrading

Earlier versions hardcoded a specific view (herbarium_search). After upgrading, each field using this formatter must be reconfigured on its Manage display page to select a facet source and facet. Until configured, the field renders as plain text.