app/indexers/hyrax/pcdm_collection_indexer.rb in hyrax-4.0.0.beta1 vs app/indexers/hyrax/pcdm_collection_indexer.rb in hyrax-4.0.0.beta2

@@ -14,9 +14,10 @@
 
     def to_solr
       super.tap do |index_document|
         index_document[Hyrax.config.collection_type_index_field.to_sym] = Array(resource.try(:collection_type_gid)&.to_s)
         index_document[:generic_type_sim] = ['Collection']
+        index_document[:member_of_collection_ids_ssim] = resource.member_of_collection_ids.map(&:to_s)
         index_document[:depositor_ssim] = [resource.depositor]
         index_document[:depositor_tesim] = [resource.depositor]
       end
     end
   end