Update field used for collections in a backwards compatible way, sort…

app/controllers/catalog_controller.rb

@@ -149,7 +149,10 @@ class CatalogController < ApplicationController
     config.add_facet_field 'folder_name_ssi', label: 'Folder Name', limit: true
     config.add_facet_field 'donor_tags_ssim', label: 'Donor tags', limit: true
     config.add_facet_field 'doc_subtype_ssi', label: 'Document Subtype', limit: true
-    config.add_facet_field 'collection_with_title', label: 'Collection', limit: true, helper_method: :collection_title
+    config.add_facet_field 'collection_leading_title',
+                           label: 'Collection',
+                           limit: true,
+                           helper_method: :collection_title
 
     # Have BL send all facet field names to Solr, which has been the default
     # previously. Simply remove these lines if you'd rather use Solr request
@@ -209,7 +212,7 @@ class CatalogController < ApplicationController
     # This was added for the Feigbenbaum exhibit.  It includes any general <note> from
     #  the MODs that do not have attributes.  It is used for display and is not facetable.
     config.add_index_field 'general_notes_ssim', label: 'Notes', helper_method: :notes_wrap
-    config.add_index_field 'collection_with_title', label: 'Collection', helper_method: :document_collection_title
+    config.add_index_field 'collection_leading_title', label: 'Collection', helper_method: :document_collection_title
     # Fields specific to Parker Exhibit
     config.add_index_field 'incipit_tesim', label: 'Incipit'
     config.add_index_field 'toc_search', label: 'Table of contents', helper_method: :table_of_contents_separator

app/helpers/application_helper.rb

@@ -2,10 +2,10 @@
 
 # :nodoc:
 module ApplicationHelper
-  # Collection titles are indexed as a compound druid + title; we need to
+  # Collection titles are indexed as a compound title + druid; we need to
   # unmangle it for display.
   def collection_title(value, separator: '-|-')
-    value.split(separator).last
+    value.split(separator).first
   end
 
   def document_collection_title(value:, **)

lib/traject/dor_config.rb

@@ -20,6 +20,9 @@
 to_field 'display_type', conditional(->(resource, *_) { !resource.collection? }, accumulate { |resource, *_| display_type(dor_content_type(resource)) })
 
 to_field 'collection', (accumulate { |resource, *_| resource.collections.map(&:bare_druid) })
+to_field 'collection_leading_title', (accumulate do |resource, *_|
+  resource.collections.map { |collection| "#{coll_title(collection)}-|-#{collection.bare_druid}" }
+end)
 to_field 'collection_with_title', (accumulate do |resource, *_|
   resource.collections.map { |collection| "#{collection.bare_druid}-|-#{coll_title(collection)}" }
 end)

solr/config/schema.xml

@@ -216,8 +216,10 @@
     <field name="modsxml" type="string" indexed="false" stored="true" />
     <!-- collection (facet and display): "sirsi" or, for DOR items, the id of their parent coll -->
     <field name="collection" type="string" indexed="true" stored="true" multiValued="true" omitNorms="true" />
-    <!-- collection_with_title: easy way to indicate item's parent coll title in UI (may be deprecated in future) -->
+    <!-- DEPRECATED: collection_with_title: easy way to indicate item's parent coll title in UI (may be deprecated in future) -->
     <field name="collection_with_title" type="string" indexed="true" stored="true" multiValued="true" />
+    <!-- collection_leading_title: easy way to indicate item's parent coll title in UI, sortable by A-Z (may be deprecated in future) -->
+    <field name="collection_leading_title" type="string" indexed="true" stored="true" multiValued="true" />
     <!-- collection_search: allow searching within collections for aggr. colls -->
     <field name="collection_search" type="string_punct_stop" indexed="true" stored="true" multiValued="true" omitNorms="true" />
     <!-- display_type: used by UI code, e.g. 'file' or 'image' -->

solr/config/solrconfig.xml

@@ -810,6 +810,7 @@
       <str name="facet.field">pub_year_tisim</str>
       <str name="facet.field">topic_facet</str>
       <str name="facet.field">collection_with_title</str>
+      <str name="facet.field">collection_leading_title</str>
 
       <!-- Highlighting defaults -->
       <str name="hl.fl">all_search full_text_search full_text_search_en full_text_search_pt full_text_search_id</str>
@@ -823,6 +824,7 @@
         author_person_full_display,   vern_author_person_full_display,
         collection,
         collection_type,
+        collection_leading_title,
         collection_with_title,
         crez_course_info,
         db_az_subject,

spec/features/indexing_integration_spec.rb

@@ -123,6 +123,7 @@
 
     it 'has collection information' do
       expect(document).to include collection: ['ms016pb9280'],
+                                  collection_leading_title: ['Edward A. Feigenbaum papers, 1950-2007 (inclusive)-|-ms016pb9280'],
                                   collection_with_title: ['ms016pb9280-|-Edward A. Feigenbaum papers, 1950-2007 (inclusive)'],
                                   collection_titles_ssim: ['Edward A. Feigenbaum papers, 1950-2007 (inclusive)']
     end

spec/fixtures/sample_solr_docs.json

@@ -2748,6 +2748,7 @@
     "spotlight_resource_id_ssim": null,
     "spotlight_resource_type_ssim": "dor_harvesters",
     "collection": ["ms016pb9280"],
+    "collection_leading_title": ["ms016pb9280-|-Edward A. Feigenbaum papers, 1950-2007 (inclusive)"],
     "collection_with_title": ["Edward A. Feigenbaum papers, 1950-2007 (inclusive)-|-ms016pb9280"],
     "author_person_facet": ["A. Rosenfeld"],
     "author_person_display": ["A. Rosenfeld"],

spec/helpers/application_helper_spec.rb

@@ -5,17 +5,17 @@
 describe ApplicationHelper, type: :helper do
   describe '#collection_title' do
     it 'unmangles the collection title from the compound field' do
-      expect(helper.collection_title('foo-|-bar')).to eq 'bar'
+      expect(helper.collection_title('foo-|-bar')).to eq 'foo'
     end
   end
 
   describe '#collection_title_for_index_field' do
     it 'unmangles the collection title from the compound field' do
-      expect(helper.document_collection_title(value: 'foo-|-bar')).to eq 'bar'
+      expect(helper.document_collection_title(value: 'foo-|-bar')).to eq 'foo'
     end
 
     it 'handles multivalued fields' do
-      expect(helper.document_collection_title(value: ['foo-|-bar', 'baz-|-bop'])).to eq 'bar and bop'
+      expect(helper.document_collection_title(value: ['foo-|-bar', 'baz-|-bop'])).to eq 'foo and baz'
     end
   end