add a comment about map

sul-dlss · Dec 4, 2019 · 96ba763 · 96ba763
1 parent a40f117
commit 96ba763
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/app/services/metadata_service.rb b/app/services/metadata_service.rb
@@ -13,6 +13,8 @@ class << self
     def resolvable(identifiers)
       res_ids = identifiers.select { |identifier| can_resolve?(identifier) }
       VALID_PREFIXES.map { |prefix| res_ids.find { |res_id| res_id.start_with?(prefix.to_s) } }.compact
+      # NOTE: the purpose of .map here is to ensure we return any resolvable identifiers in the the
+      #       preferred order specificed above in KNOWN_PREFIXES, so that the .first is the preferred one
     end
 
     def fetch(identifier)