Index subject fields to combined_subject facet (#836)

Co-authored-by: parinita <[email protected]>

app/indexers/work_indexer.rb

@@ -15,23 +15,28 @@ class WorkIndexer < Hyrax::WorkIndexer
 
   def generate_solr_document
     super.tap do |solr_doc|
-      solr_doc['sort_year_isi'] = years.to_a.min
+      solr_doc['combined_subject_ssim'] = combined_subject
+      solr_doc['date_dtsim'] = solr_dates
       solr_doc['geographic_coordinates_ssim'] = coordinates
+      solr_doc['human_readable_iiif_text_direction_ssi'] = human_readable_iiif_text_direction
+      solr_doc['human_readable_iiif_viewing_hint_ssi'] = human_readable_iiif_viewing_hint
       solr_doc['human_readable_language_sim'] = human_readable_language
       solr_doc['human_readable_language_tesim'] = human_readable_language
       solr_doc['human_readable_resource_type_sim'] = human_readable_resource_type
       solr_doc['human_readable_resource_type_tesim'] = human_readable_resource_type
-      solr_doc['human_readable_iiif_text_direction_ssi'] = human_readable_iiif_text_direction
-      solr_doc['human_readable_iiif_viewing_hint_ssi'] = human_readable_iiif_viewing_hint
       solr_doc['human_readable_rights_statement_tesim'] = human_readable_rights_statement
+      solr_doc['sort_year_isi'] = years.to_a.min
+      solr_doc['thumbnail_url_ss'] = thumbnail_url
       solr_doc['title_alpha_numeric_ssort'] = object.title.first
       solr_doc['ursus_id_ssi'] = Californica::IdGenerator.blacklight_id_from_ark(object.ark)
       solr_doc['year_isim'] = years
-      solr_doc['date_dtsim'] = solr_dates
-      solr_doc['thumbnail_url_ss'] = thumbnail_url
     end
   end
 
+  def combined_subject
+    object.named_subject.to_a + object.subject.to_a + object.subject_topic.to_a + object.subject_geographic.to_a + object.subject_temporal.to_a
+  end
+
   def coordinates
     return unless object.latitude.first && object.longitude.first
     [object.latitude.first, object.longitude.first].join(', ')

spec/indexers/work_indexer_spec.rb

@@ -6,6 +6,36 @@
   let(:work) { Work.new(attributes) }
   let(:indexer) { described_class.new(work) }
 
+  describe 'combined_subject' do
+    let(:attributes) do
+      {
+        ark: 'ark:/123/456',
+        subject: ['Subject 1', 'Subject 2'],
+        named_subject: ['Named Subject'],
+        subject_topic: ['Subject Topic'],
+        subject_geographic: ['Subject Geographic']
+      }
+    end
+
+    it 'combines the relevant subject fields' do
+      expect(solr_document['combined_subject_ssim']).to contain_exactly('Subject 1', 'Subject 2', 'Named Subject', 'Subject Topic', 'Subject Geographic')
+    end
+
+    context 'When subject fields are missing' do
+      let(:attributes) do
+        {
+          ark: 'ark:/123/456',
+          named_subject: ['Named Subject'],
+          subject_topic: ['Subject Topic']
+        }
+      end
+
+      it 'combines the fields that are present' do
+        expect(solr_document['combined_subject_ssim']).to contain_exactly('Named Subject', 'Subject Topic')
+      end
+    end
+  end
+
   describe 'resource type' do
     context 'a work with a resource type' do
       let(:attributes) do