fix bug

https://sentry.io/organizations/datacite/issues/1424896389/events/ba7345c8312e41de979ae162c420c5e8/?project=1422419&query=is%3Aunresolved

Author: kjgarza

app.rb

@@ -180,8 +180,8 @@
   unless request.is_crawler?
     events  = get_events('page[size]' => 1, 'page[number]' => @page, 'doi' => doi, 'sort' => 'relation_type_id')
     @work[:metrics] = reduce_aggs(events[:meta], { yop: @work.dig(:data, "attributes","published").to_i })
-    @work[:metrics].merge!("unique-dataset-investigations-regular" => (events[:meta].fetch('doisUsageTypes', []).first.fetch("relationTypes",[]).find { |x| x['id'] == "unique-dataset-investigations-regular" }.fetch("sum",0))) 
-    @work[:metrics].merge!("unique-dataset-requests-regular" => (events[:meta].fetch('doisUsageTypes', []).first.fetch("relationTypes",[]).find { |x| x['id'] == "unique-dataset-requests-regular" }.fetch("sum",0)))
+    @work[:metrics].merge!(views_hash(events[:meta].fetch('doisUsageTypes', [])))
+    @work[:metrics].merge!(downlaods_hash(events[:meta].fetch('doisUsageTypes', [])))
     @work[:metrics].merge!(citations: (events[:meta].fetch('uniqueCitations', []).find { |x| x['id'] == doi } || {}))
     @work[:metrics].merge!(citations_histogram: events[:meta].fetch('citationsHistogram', {}))
     @work[:metrics].merge!(views_histogram: events[:meta].fetch('viewsHistogram', {}))

lib/helpers.rb

@@ -137,6 +137,18 @@ def pagination_helper(items, page, total, rows = DEFAULT_ROWS)
       end
     end
 
+    def views_hash(array)
+      return {} unless array.any?
+      
+      {"unique-dataset-investigations-regular" => array.first.fetch("relationTypes",[]).find { |x| x['id'] == "unique-dataset-investigations-regular" }.fetch("sum",0)}
+    end
+
+    def downlaods_hash(array)
+      return {} unless array.any?
+
+      {"unique-dataset-requests-regular" => array.first.fetch("relationTypes",[]).find { |x| x['id'] == "unique-dataset-requests-regular" }.fetch("sum",0)}
+    end
+
     def reduce_aggs(meta, options = {})
       meta = ::JSON.parse(meta) if meta.respond_to?("downcase")
       relation_types = meta.fetch("relationTypes",[])