🐛 Fix "Sort by: Published Date"

This commit fixes a bug in the ability to sort works by "Published
date", "Upload date", and "Title" in the catalog search page and the
collection show page.

Ref:
- notch8/adventist_knapsack#185

app/indexers/concerns/hyku_indexing.rb

@@ -24,24 +24,44 @@ module HykuIndexing
         # TODO: Reinstate once valkyrie fileset work is complete - https://github.com/scientist-softserv/hykuup_knapsack/issues/34
         solr_doc['all_text_tsimv'] = full_text(object.file_sets.first&.id) if object.kind_of?(ActiveFedora::Base)
         # rubocop:enable Style/ClassCheck
+        solr_doc['title_ssim'] = SortTitle.new(object.title.first).alphabetical
+        solr_doc['depositor_ssi'] = object.depositor
+        solr_doc['creator_ssim'] = object.creator&.first
+        if object.respond_to?(:date_created)
+          solr_doc[CatalogController.created_field] =
+            Array(object.date_created).first
+        end
         add_date(solr_doc)
       end
     end
   end
 
+  private
+
   def full_text(file_set_id)
     return if !Flipflop.default_pdf_viewer? || file_set_id.blank?
 
     SolrDocument.find(file_set_id)['all_text_tsimv']
   end
 
   def add_date(solr_doc)
-    # The allowed date formats are either YYYY, YYYY-MM, or YYYY-MM-DD
-    # the date must be formatted as a 4 digit year in order to be sorted.
-    valid_date_formats = /\A(\d{4})(?:-\d{2}(?:-\d{2})?)?\z/
     date_string = solr_doc['date_created_tesim']&.first
-    year = date_string&.match(valid_date_formats)&.captures&.first
-    solr_doc['date_tesi'] = year if year
-    solr_doc['date_ssi'] = year if year
+    return unless date_string
+
+    date_string = pad_date_with_zero(date_string) if date_string.include?('-')
+
+    # The allowed date formats are either YYYY, YYYY-MM, or YYYY-MM-DD
+    valid_date_formats = /\A(\d{4}(?:-\d{2}(?:-\d{2})?)?)\z/
+    date = date_string&.match(valid_date_formats)&.captures&.first
+
+    # If the date is not in the correct format, index the original date string
+    date ||= date_string
+
+    solr_doc['date_tesi'] = date if date
+    solr_doc['date_ssi'] = date if date
+  end
+
+  def pad_date_with_zero(date_string)
+    date_string.split('-').map { |d| d.rjust(2, '0') }.join('-')
   end
 end