force doi fields into an array

app/models/doi.rb

@@ -316,11 +316,11 @@ def as_indexed_json(options={})
       "doi" => doi,
       "identifier" => identifier,
       "url" => url,
-      "creators" => creators,
-      "contributors" => contributors,
+      "creators" => Array.wrap(creators),
+      "contributors" => Array.wrap(contributors),
       "creator_names" => creator_names,
-      "titles" => titles,
-      "descriptions" => descriptions,
+      "titles" => Array.wrap(titles),
+      "descriptions" => Array.wrap(descriptions),
       "publisher" => publisher,
       "client_id" => client_id,
       "provider_id" => provider_id,
@@ -330,19 +330,19 @@ def as_indexed_json(options={})
       "suffix" => suffix,
       "types" => types,
       "identifiers" => identifiers,
-      "related_identifiers" => related_identifiers,
-      "funding_references" => funding_references,
+      "related_identifiers" => Array.wrap(related_identifiers),
+      "funding_references" => Array.wrap(funding_references),
       "publication_year" => publication_year,
       "dates" => dates,
-      "geo_locations" => geo_locations,
-      "rights_list" => rights_list,
+      "geo_locations" => Array.wrap(geo_locations),
+      "rights_list" => Array.wrap(rights_list),
       "container" => container,
       "content_url" => content_url,
       "version_info" => version_info,
-      "formats" => formats,
-      "sizes" => sizes,
+      "formats" => Array.wrap(formats),
+      "sizes" => Array.wrap(sizes),
       "language" => language,
-      "subjects" => subjects,
+      "subjects" => Array.wrap(subjects),
       "xml" => xml,
       "is_active" => is_active,
       "landing_page" => landing_page,